Rule of professionalism #1:
Don't call 3 hours before the interview to ask if I have some flexibility to make it for an earlier or later time.

Rule of professionalism #2:
Especially don't do that if you haven't done your homework enough to realize that I'm coming in by a 1 1/2 hour train ride.

Rule of professionalism #3:
Don't admit that the reason you need to change the interview time is because you just realized that your boss wants you on a conference call at that time.