1st Step: Create an email template.
Follow this method (ignore the 4th step): https://intercom.help/bsport-helpcenter/en/articles/3527707-create-an-email-template-and-send-it
2nd Step: Add a notification.
In Marketing > Notifications > Add a notification.
3rd Step: Choose a type of booking to be notified and the event starting the notification.
Maintained bookings
Cancelled and refunded bookings
Send this notification to every booking
4th Step: Choose the type of notification, set up when to send the email and the template to send.
Send the email to the client before the appointment
Send email X hour(s) before the session
Choose the email template to send > Click on 'Save'.
You have just created a notification to send a reminder for a private appointment to your student.