You can reschedule your appointments in MyChart instead of cancelling them. 

How to reschedule appointments in MyChart

  1. Navigate to Visits → Upcoming & Past Visits.

  2. Click Details to find additional information about the appointment.

    Uploaded via media manager.
  1. From the detailed screen, choose Reschedule.  Note: this will only appear on visits you can reschedule in MyChart and will not be an option for all office visits.