Would you please tell if I need to use give you a call or give you a call back in the context below.
Customer: I'm calling to schedule an appointment with the doctor at 1pm tomorrow.
Receptionist: Sure. It looks like he has an opening at that time tomorrow. I'll fit you in and if anything changes, I'll give you a call (back).
It seems to me either one can be used. Please tell me if I'm wrong and if so, explain the logic behind using one and not the other.