Un cancel? A word or phrase to say I'd like to cancel my cancellation
Say I have cancelled an appointment, but I then decide that I would like to go after all, so I cancel the cancellation... Do I uncancel the appointment? Seems a bit clumsy even if it's a valid expression.
When I need to do this I call to rebook the appointment. That is the same as calling to reinstate the booking.
Alternatively, you can revoke, reverse, or undo the cancellation.
I agree. I like rebook. You could also say undo or reschedule, but the latter could also be inferred as you are scheduling for a different time.