answer: #Person1# buys one second-class ticket on the express train to New York with #Person2#'s assistance.
documents: #Person1#: We want to take a train to New York.
  #Person2#: Regular or express train?
  #Person1#: How much time would I save if we took the express?
  #Person2#: About one hour. The next express train arrives in New York at 3:15.
  #Person1#: And how much more do I have to pay for the express?
  #Person2#: First class is 24 dollars more, and second class is 15 dollars more.
  #Person1#: As long as we can arrive one hour earlier, I don't mind paying a little extra. Then give me one second class ticket on the express, please.
  #Person2#: OK, one second class ticket. Here you are.
  #Person1#: Thank you.