answer: #Person1# assists #Person2# in buying trousers to match #Person2#'s shirt.
documents: #Person1#: We have a variety of trousers. Which one do you like best?
  #Person2#: I want to buy one to match my shirt. Can you give me some advice?
  #Person1#: What about this one?
  #Person2#: Yes, they seem to be my size and go with my shirt quite well. I will take it.