answer: #Person1# asks #Person2# a cheap way to get to the airport. #Person2# guides #Person1# to take the subway and then transfer to the airport express's train.
documents: #Person1#: Excuse me where is the airport?
  #Person2#: Um, it's pretty far away. I can show you on the map on my smart phone.
  #Person1#: Oh, sorry, and what I meant is how can I get there?
  #Person2#: Well, that depends. Do you want to get there quickly or cheaply?
  #Person1#: Probably the latter would be better.
  #Person2#: All right. If you go down one block and take a left, you'll see the number 12 subway station. Take the number 12 all the way to Grove Street. And then transferred to the airport express' train.
  #Person1#: How will I know where to change trains?
  #Person2#: There will be announcements on the train. But I'm sure there will also be a lot of other people with big suitcases. You can just follow them.