Let's say I would like to reschedule an appointment, but to make it sooner, rather than later. I would like to know the most natural way a German speaker would say this. I'm familiar with "verschieben", but I'm afraid that carries the connotation that it will be scheduled for a later point in time.
As an American English speaker, I would say "to move it up." However, tranlating that into German doesn't give results that refer to time.