answer: #Person1# wants black ink but there's none in stock. #Person1# then gets blue-black ink, airmail envelopes, and shoelaces with #Person2#'s assistance.
documents: #Person1#: Do you carry black ink?
  #Person2#: The ink should be next to the paper clips and thumb tacks in the stationary section, sir.
  #Person1#: I've looked for, but I didn't see any black ink.
  #Person2#: Then I'm afraid there's none in stock.
  #Person1#: Well, I'll settle for blue-black. I'll also take a dozen airmail envelopes.
  #Person2#: They come in packages of ten or twenty.
  #Person1#: Give me a package of twenty, then. And where do I find shoelaces?
  #Person2#: On counter three.
  #Person1#: Thank you. I never can find my way around this store.
  #Person2#: I know. It took me three weeks, and I work here.