answer: #Person1# asks Mike to help with a yard sale tomorrow afternoon and tells Mike what a yard sale is. Mike agrees.
documents: #Person1#: Mike, could you help me tomorrow afternoon? I'll have a yard sale from 3:00 PM to 5:00 PM.
  #Person2#: OK, but could you tell me what a yard sale is?
  #Person1#: It's a sale held in someones yard selling news things, it's a great way to make some money from our old things.
  #Person2#: I never did that in my country. We usually just throw away our old things.
  #Person1#: That's really a waste. You know something useless to you may be very useful to someone else. Sometimes you can give them to your friends or relatives.
  #Person2#: I agree, I think yard sales can also be good for the environment.