Schedule Update - Confirmation, Cancellation and Reschedule Email Customization
You can now customize your auto email templates for the when the client books an appointment with you, when they cancel, and when they reschedule. Reminder: These 3 canned emails are sent automatically and there is nothing that you need to do to send them.
To customize, head to TEMPLATES >> CANNED EMAILS >> EDIT TEMPLATES
Within those canned emails there are the correct smart fields for populating the appointment information.