answer: #Person2# tells #Person1# that #Person1# can buy one round trip ticket for one free. #Person1# buys two adult tickets and one child's ticket.
documents: #Person1#: Hello, I need some information about a round trip ticket from Oakland to Los Angeles.
  #Person2#: OK. A round trip ticket is $130. And we're now having a special offer. If you buy two round trip tickets, one is free.
  #Person1#: Really? That's great! And what's the price for a ten-year-old child?
  #Person2#: Children under twelve are half price.
  #Person1#: OK. Do you have tickets for this Friday afternoon from Oakland, coming back on Sunday afternoon?
  #Person2#: Let me see. No, I'm sorry, but we have tickets for next weekend. Would that be OK?
  #Person1#: Yes, we could go next week. I'd like to get two adult tickets and one child's ticket.
  #Person2#: OK. That comes to $195.