The only difference being that there is an intention to still have the appointment at some unspecified future time. In most cases though you can just treat them like a special form of cancellation.
People Also Ask
Examples from Collins dictionariesSince I'll be away, I'd like to reschedule the meeting. They've rescheduled the vigil for February 14th. The programme was rescheduled to 9.30pm by the controller of BBC1. A banking syndicate have agreed to reschedule debts of almost $600 million.