answer: Mary is waiting for a bus to go for a walk in the park but the buses are very full. Bill advises her to walk but Mary thinks walking is boring.
documents: #Person1#: Hello, Mary. Why are you standing here in the cold wind?
  #Person2#: I'm waiting for a bus, but the buses are very full at this time of the day.
  #Person1#: Where are you going? This isn't your way home. You must take a bus from the other side of the street to go home.
  #Person2#: I'm not going home now. I'm going for a walk in the park. I always like to go for a walk before lunch.
  #Person1#: Then why aren't you going there on foot? Why are you going by bus? Why not walk to the park from here? It isn't very far.
  #Person2#: Oh, no, Bill. It isn't very interesting to walk through the streets, in fact, it's very boring. So I always take bus No. 3.