answer: #Person2# buys a pair of trousers with #Person1#'s assistance.
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.