answer: #Person2# buys some paper for writing letters, envelopes, and five fifty-cent stamps with #Person1#'s assistance.
documents: #Person1#: Excuse me. Can I help you?
  #Person2#: Er... Could I have some writing paper and envelopes?
  #Person1#: Do you mean paper for writing letters?
  #Person2#: Yes.
  #Person1#: They are here in the showcase. Which one would you like?
  #Person2#: I want this kind of paper and that kind of envelope.
  #Person1#: All right, sir. Anything else?
  #Person2#: Yes, five fifty-- cent stamps.
  #Person1#: Er... There will be four dollars and sixty cents altogether.
  #Person2#: Here is five dollars.
  #Person1#: Thank you. Here is the change.
  #Person2#: Thanks.