You can send SMS/TXT reminders to your customers to remind them of their booking.
In this article:
If you want to enable SMS/TXT reminders for your customers to remind them of their booking:
1. Go to Settings>Reminders
2. In the SMS reminders section, tick the checkbox Send an SMS reminder to the customer  to enable SMS reminders. You can also set how in advance - before the start of the appointment - you want to send SMS reminders .
SMS/TEXT reminders require the purchase of credits
You can see below an example of SMS/TXT reminder.
At the moment it is not possible to customize SMS/TXT reminders.