A: Hello, I've got to get up early tomorrow, so please give me a wake-up call.
B: Of course. We can give you a call anytime you like.
A: Actually, I need two calls, one at 7 and the other at 7:15.
B: Your wish is our command. Expect a call at 7, and another one at 7:15.
A: Wait a minute! I don't like 7:15, now that I think about it. Change it to 7:30.
B: The second call is now changed to 7:30. Is there anything else we can help you with?
A: Nothing that I can think of right now. If something comes up, though, I'll call you.
B: We're here all night long if you need anything.
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