answer: #Person1# buys two train tickets to London with #Person2#'s assistance.
documents: #Person1#: Excuse me. What time does the next train to London leave?
  #Person2#: At 10:30.
  #Person1#: Is it a direct train to London?
  #Person2#: Yes, it is.
  #Person1#: OK. Two tickets to London, please.
  #Person2#: Single or return?
  #Person1#: Single, please. How much in total?
  #Person2#: 10 pounds.
  #Person1#: Here you are. Which platform should I go to wait for the train?
  #Person2#: It's platform 5.
  #Person1#: OK. Thank you.
  #Person2#: You are welcome.