answer: #Person1# asks #Person2# for directions to the 70th Street.
documents: #Person1#: Good! There's the information desk. How do we get to the 70th Street, please?
  #Person2#: The Northern Line is what you want.
  #Person1#: How much is it?
  #Person2#: It's two yuan.
  #Person1#: Which way do we go for the Northern Line?
  #Person2#: Just go through the No. 8 ticket-barrier over there. A train will be in directly.
  #Person1#: I appreciate it. Thank you.
  #Person2#: That's all right.