answer: Kathy's driving downtown and invites Tom to come along, but Tom has to study. Kathy will help Tom pick up the watch. Then Tom changes his mind and will go with Kathy to buy something.
documents: #Person1#: Julia and I are driving downtown this afternoon. Want to come, Tom?
  #Person2#: Thanks, Kathy, but I've got to study. I'm way behind in maths.
  #Person1#: Well, in that case, is there anything we can get for you?
  #Person2#: Gee. I left my watch at Gelson's the other day. It should be ready by now.
  #Person1#: I'd be glad to pick it up.
  #Person2#: Well, Kathy, now that I think about it. I've got something else to do downtown. I have to buy something at the supermarket. Maybe I'd better go with you.
  #Person1#: We'll be leaving from the parking lot. I'm behind with my work, so we'll only be there a couple of hours.
  #Person2#: Oh, if it's only a couple of hours, I can certainly go.
  #Person1#: Great. See you in a few minutes.