To customer your rebooking reminders go to your Marketing tab and hover over the status of the event you want to edit and click on Edit. You will see a reminder for each one of your services.
Note: You can only customize rebooking reminders if you are on the following subscriptions: Premium, Growth, or Automated Email + SMS Marketing
If you don't have these packages, you can still turn these reminders on or off and customize a few of the options by clicking into them.
To edit the email/text click Edit and customize your email with your own photo/logo, text, font, and frequency. 
For more information contact us at support@mytime.com.