answer: #Person1# is calling #Person2# to arrange wake-up calls for tomorrow, at 7 and 7:30, respectively.
documents: #Person1#: Hello, I've got to get up early tomorrow, so please give me a wake-up call.
  #Person2#: Of course. We can give you a call anytime you like.
  #Person1#: Actually, I need two calls, one at 7 and the other at 7 fifteen.
  #Person2#: Your wish is our command. Expect a call at 7, and another one at 7 fifteen.
  #Person1#: Wait a minute! I don't like 7 fifteen, now that I think about it. Change it to 7 thirty.
  #Person2#: The second call is now changed to 7 thirty. Is there anything else we can help you with?
  #Person1#: Nothing that I can think of right now. If something comes up, though, I'll call you.
  #Person2#: We're here all night long if you need anything.