answer: #Person2# asks #Person1# to buy an exercise book and a pen, and to post a letter for Sam.
documents: #Person1#: Bye for now.
  #Person2#: Bye. But where are you going?
  #Person1#: The bank, the supermarket and...
  #Person2#: Will you buy an exercise book for me?
  #Person1#: I guess so. But I'll go to the post office first before I go to the supermarket.
  #Person2#: Can you also buy me a pen? The one you gave me last week doesn't work now.
  #Person1#: How come?
  #Person2#: It fell off the desk and was broken.
  #Person1#: Can you be more careful with your things?
  #Person2#: Ok. Oh. Can you wait a second?
  #Person1#: What for?
  #Person2#: You are going to the post office, right?
  #Person1#: Yes, so what?
  #Person2#: Here's a letter for Sam. Can you post it?