A:I had an appointment tomorrow and I need to change it to a 

different date.

B: Certainly, what day would be best for you?

A: I think that Monday or Tuesday would be good for me.

B:I can give you Monday; I have ten or eleven in the morning.

A: I think ten o'clock is best.

B:Fine, I'll put you down for that.

A: That would be great!

B: Happy I could help you; see you then!