: 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.