answer: Allen wants to exchange the sweater and she tries the clothes on. #Person3# and #Person2# prefer the red but Allen likes the black. Allen finally switches to the red one.
documents: #Person1#: Excuse me. Could you help me? I'd like to exchange this sweater. 
  #Person2#: What's the problem with it? 
  #Person1#: It was a birthday gift, but I don't really like it. I think I want something plainer. 
  #Person2#: I see . . . Well, why don't you look around? 
  #Person3#: I like these two, Allen. Try them on. 
  #Person1#: OK. So, which one do you like? 
  #Person3#: I like the red one much better than the black one. 
  #Person1#: Really? How come? I kind of like the black one. 
  #Person3#: The red one is longer and a little looser so it will be more comfortable. 
  #Person1#: True . . . and it feels softer. 
  #Person2#: And that color looks better on you. Actually, it's a better quality and it's the same price as the sweater you're exchanging. 
  #Person1#: You've talked me into it! I'll take this one instead. 
  #Person2#: No problem. I'll switch them for you.