answer: #Person1# asks #Person2# to give #Person1# two wake-up calls tomorrow morning at 7:00 and 7:30.
documents: #Person1#: Hi. I need a wake-up call tomorrow.
  #Person2#: What time would you like your wake-up call?
  #Person1#: I need two calls, one at 7 and another at 7 fifteen.
  #Person2#: That is no problem at all, of course. You'll get a call at 7 o'colock and another at 7 fifteen.
  #Person1#: Then again, I think 7 fifteen is too early. Change 7 fifteen to 7 thirty, please.
  #Person2#: So, that'll be a call at 7 and another at 7 thirty. Do you have any other requests?
  #Person1#: Not just now, but if I do think of something later, I'll give you a ring.
  #Person2#: Okay, sir. Sleep well.