answer: #Person2# tells #Person1# about the advantages of the express train so #Person1# decides to buy two express tickets with window seats.
documents: #Person1#: Good morning, two tickets to London, please.
  #Person2#: Express train or regular one?
  #Person1#: Any difference?
  #Person2#: The regular ticket is 80 dollars while price of the express ticket is 10% higher.
  #Person1#: I see, but how long does the express train take?
  #Person2#: Comparatively, it can save you nearly an hour and the next one is leaving at 10:45.
  #Person1#: Oh, we only have 15 minutes to go. But that's the time to catch the train. Besides, as long as I get to London earlier, I don't mind paying a little extra.
  #Person2#: And in preference for the seat?
  #Person1#: A window seat would be perfect. I always love to enjoy the view outside while taking the train.
  #Person2#: No problem. Here is your ticket, wish you a pleasant trip.
  #Person1#: Thanks.