answer: #Person1# wants to choose a sweater as #Person1#'s girlfriend birthday gift and #Person2# helps #Person1# find a red one of suitable size.
documents: #Person1#: Excuse me. Uh, I want to get my girlfriend a sweater for her birthday, but I can't find the right one.
  #Person2#: Well, um, what about these over here?
  #Person1#: Uh, this one is okay. I like the style, but do you the same thing in a blue, a blue color?
  #Person2#: Um, well, Hmm. I don't ... I don't see a blue one, but about this green one?
  #Person1#: Uh, do you have the same thing in a dark green? And what size is this one anyway?
  #Person2#: It's a large.
  #Person1#: Oh, my girlfriend wears a small. That won't work.
  #Person2#: Well, what about this red one?
  #Person1#: Ummm, it's okay. How much is it? I don't see a price tag.
  #Person2#: Well, let's see. It usually sells for $34, but it's on sale for $16.
  #Person1#: Hmm. Okay, I'll take it. Thanks.