answer: Mrs. Smith wants to buy a pair of shoes for Tom. Mr. White recommends her to buy a pair of strong and comfortable sports shoes.
documents: #Person1#: Hi, Mrs. Smith. Nice to see you here.
  #Person2#: Hi, Mr. White. I'm here to buy a pair of shoes for Tom again.
  #Person1#: He wore out the pair you bought last month?
  #Person2#: Yes. Sometimes I think I should buy him a pair of iron shoes.
  #Person1#: Oh, no. What you need is a pair of strong and comfortable shoes.
  #Person2#: What's your suggestion?
  #Person1#: Maybe you should buy him a pair of leather shoes.
  #Person2#: Tom doesn't like leather shoes.
  #Person1#: Then, how about sports shoes? They are strong and comfortable.
  #Person2#: It seems that is the only choice. All right. I'll take your suggestion. How about this pair?
  #Person1#: They are good.