To edit the content of booking and reminder messages, go to Business Setup -> Your Clinic -> Message Settings
Within Message Settings, you have the option select Booking SMS, Booking Emails, Reminder SMS or Reminder Emails.
Select which type of message you would like to edit.
Within each type, you have a service category drop down menu. Your services are group together by these service categories such as Initial Appointment and Follow Up Appointment.
Each service category is treated as it's own individual message.
After selecting a service category, you can edit the Subject and email Body. After making your changes, click SAVE.