answer: #Person1# invites #Person2# to a picnic. #Person2# wants to invite Jenny but #Person1# says she's busy with her dancing class. #Person2#'s camera isn't available, so they'll ask Mary who's got one to join them.
documents: #Person1#: Do you want to go for a picinc with me tomorrow?
  #Person2#: I'd like to. How about asking Jenny to go with us?
  #Person1#: Oh, no. She is busy with her dancing class. You know, there is a very big performance in just a week.
  #Person2#: Yes, you're right. It is really not good for her to learn dancing. Her leg hasn't completely recovered from that accident.
  #Person1#: But she doesn't think so. She is crazy about dancing. Will you take your camera with you tomorrow?
  #Person2#: I want to, but I lent it to Tom yesterday. Do you have one?
  #Person1#: No, but I know Mary has got one. Let's go and ask her if she'd like to join us.
  #Person2#: OK.