You can set a deadline by which guests can cancel or reschedule their appointments.
By default, you can cancel until the end of the appointment. (If the appointment is scheduled from 10:00 to 11:00, it can be canceled until 10:59)
The process for setting cancellation/reschedule deadline is as follows:
In the "Appointment cancellation/rescheduling deadline setting" item, check the "Set an appointment cancellation/reschedule deadline".
Set any time (the maximum time limit for a deadline that can be set in the custom settings is 720 hours.)
Cancellation deadline settings are available for Basic Plan and above.