: What can I do for you, sir?

B: I'm Tim Green in Room 1021. I want a wake-up call at 5:30 a.m. tomorrow.

A: Yes, I see. 5:30 a.m. Mr. Green. Room 1021.

B: I want to change my wake-up time.

A: OK. Could you tell me your room number and your name?

B: Tim in Room 1021.

A: And when do you want us to call you this time?

B: At 6:30 a.m. tomorrow.

A: OK. 6:30 a.m. We'll call you exactly on that time.