WhatsApp Appointment Reminders: Templates and Best Practices
By Marai ·
No-shows — clients who book and never appear — are one of the most costly problems for any service business. An empty slot means lost revenue, wasted time, and in many cases, another client who could have taken that spot.
The most effective and straightforward weapon against no-shows is automated reminders. And in Spain, where WhatsApp is the dominant messaging app, sending reminders via WhatsApp delivers the highest read rates of any channel.
Why WhatsApp Is the Most Effective Channel
The data is clear: WhatsApp messages have a far higher open rate than email or SMS. Most users read a WhatsApp message within the first few minutes of receiving it. An email, by contrast, can go unread for hours or even days — especially if it lands in Gmail’s “Promotions” tab.
For an appointment reminder, speed matters. You need the client to read it, process it, and — if they can’t make it — let you know with enough notice to fill that slot.
When to Send Reminders: The Five Key Moments
Not all reminders are equal, nor do they serve the same purpose. The key is combining multiple sends at different times based on the type of service and how far in advance the booking was made.
24 Hours Before
The most universal and effective reminder. It works for virtually any service business. It gives the client enough time to reorganise if there’s a conflict, and leaves you a window to offer the slot to another client if they cancel.
Best for: appointments booked several days in advance — hairdressers, dental clinics, beauty centres, physiotherapists.
12 Hours Before
Useful as a second reinforcement for high-value services (long treatments, specialist consultations). If the appointment is at 10 a.m., the reminder arrives the night before, when the client is planning their next day.
Best for: services with a waiting list or that are difficult to reschedule.
6 Hours Before
A middle-ground timing that works well for afternoon appointments. If the appointment is at 6 p.m., the reminder arrives at noon, when the client can still let you know if they won’t be coming.
Best for: businesses operating in the late afternoon and evening.
2 Hours Before
A last-minute reminder. It won’t help fill a slot if the client cancels, but it does reduce pure forgetfulness — clients who simply forgot they had an appointment.
Best for: quick or low-cost services where no-shows are caused more by forgetfulness than by a scheduling conflict.
1 Hour Before
The final possible nudge. Very effective for clients who need to travel to your location and may need that last push.
Best for: businesses in areas with heavy traffic or limited parking.
The Recommended Combination
There is no need to activate all five. For most businesses, two reminders are enough:
- 24 hours before (the main one) + 2 hours before (reinforcement)
- Or 24 hours before + 1 hour before for services where travel time is a factor
For high-value services (multi-hour treatments, medical procedures), adding the 12-hour reminder makes sense.
Sending more than three reminders per appointment can feel excessive and may produce the opposite effect — the client silences the chat or feels overwhelmed.
Message Templates That Work
The effectiveness of a reminder depends as much on its content as on its timing. A generic message is more easily ignored than a personalised, clear one.
Standard Reminder Template
Hi [name], this is a reminder about your appointment:
Service: [service] Date: [date] Time: [time] Professional: [professional]
If you need to cancel or change the time, please reply to this message.
Key elements: client’s name, concrete appointment details, and a clear call to action.
Template with Confirmation Request
Hi [name], tomorrow you have a [service] appointment at [time].
Can you confirm you’ll be coming? Reply YES to confirm or NO to cancel.
This template adds an active confirmation step. It’s more effective at reducing no-shows because it forces the client to make a conscious decision.
Short Reminder Template (2h/1h before)
[name], don’t forget — your [service] appointment is in [time] at [location]. See you soon!
For last-minute reminders, less is more. The client already knows the details; they just need the nudge.
Cancellation Template
Hi [name], your appointment on [date] at [time] has been cancelled.
If you’d like to book another time, message us or book online at [link].
Confirming a cancellation is just as important as the original reminder — it prevents clients from showing up anyway.
Channels: Email, WhatsApp, or Both
Not every client prefers the same channel. The ideal setup lets you choose between three options:
Email Only
Suitable for clients who prefer formal communications or who don’t actively use WhatsApp. Email reminders are free and have no Meta template restrictions.
WhatsApp Only
The option with the highest read rate. Ideal for most service businesses in Spain. Messages arrive in the channel where the client already spends time.
Both Channels
The most comprehensive combination. Email arrives first (24h before) and WhatsApp acts as a reinforcement (2h before, for example). This covers both the client who checks email and the one who only looks at WhatsApp.
In Marai, this configuration can be set at the business level (for all clients) or as an individual preference per client, allowing you to personalise the channel based on each person’s preference.
Best Practices for Effective Reminders
1. Always Personalise
Including the client’s name and the specific appointment details makes the message feel relevant rather than generic spam. Messages that use names have significantly higher response rates.
2. Include a Call to Action
Every reminder should give the client the option to cancel or confirm. If the client knows they can’t make it but has no easy way to let you know, they simply won’t show up.
3. Keep It Brief
A reminder is not a marketing email. It should convey the essential information at a glance. If the client needs more than 5 seconds to understand the message, it is too long.
4. Respect Sending Hours
Don’t send reminders in the middle of the night or at unreasonable times. If the appointment is at 8 a.m., the 24-hour reminder should arrive at 8 a.m. the day before — not at 3 a.m. Configure your system to respect reasonable time windows.
5. Don’t Overdo It
More reminders does not mean fewer no-shows. There’s a point at which additional messages generate pushback. Two or three reminders per appointment is the sweet spot for most businesses.
The Impact on Client Reliability
Reminders don’t just reduce no-shows — they generate data. Every time a client confirms, cancels, or fails to respond, that information feeds their reliability profile. Over time, you can identify patterns: clients who always confirm, clients who tend to cancel at the last minute, and clients who simply don’t respond.
That data enables informed decisions: requesting a deposit from clients with a history of no-shows, offering priority slots to reliable clients, or adjusting your cancellation policy based on each client’s profile.
How to Configure This in Marai
Automatic reminders are available on all Marai plans, including the free plan. Email reminders work at no additional cost. For WhatsApp reminders, you need to have your WhatsApp number connected — available from the Starter plan.
Configuration is done from the business settings panel, where you can activate or deactivate each reminder type and set the default channels. For more details on all reminder options, visit the Marai automatic reminders page.