answer: #Person1# invites Mary to go shopping and explains coupons to Linda.
documents: #Person1#: Mary, we're going to the supermarket. Do you want to come? 
  #Person2#: Yeah. I need to get some stuff. 
  #Person1#: Let's all go together then. 
  #Person2#: Where's Lisa? 
  #Person1#: She's getting coupons from her desk. 
  #Person2#: What are coupons? 
  #Person1#: They give you discounts on some stuff that you want to buy. 
  #Person2#: Really? 
  #Person1#: Because there is a coupon for almost every product, we always bring coupons on our shopping trips.