A: Hi! I need to request a wake-up call for tomorrow morning.

B: What time do you want the call?

A: I need two calls, one at 7 and another at 7:15.

B: We can certainly do that. Expect a call from us at 7:00, and then again at 7:15.

A: Actually, can I change the latter wake-up call to 7:30 am?

B: I can certainly do that. Is there anything else?

A: I can't think of anything. If I do think of something, I'll be sure to call again.

B: Okay. Good night, sir.