Patients can reschedule or cancel their own appointment through the link in their confirmation email or SMS, if this is enabled under Appointment Defaults (Allow patient to reschedule/cancel appointment online).
However, the two actions work differently depending on how the appointment was originally booked:
Cancelling: works for any appointment, regardless of whether it was booked online, by phone, or directly in the calendar, as long as the setting above is enabled.
Rescheduling: only works for appointments that were originally booked through the online scheduler. Appointments booked by phone and entered directly into the calendar cannot be rescheduled by the patient afterwards, only cancelled.
Note: If a patient needs to change the time of an appointment that was booked by phone or added directly to the calendar, they can cancel it online (if enabled) and book a new appointment through the online scheduler, or contact the clinic directly to have it moved.