dialogue: #Person1#: Excuse me, how can I get special discount coupons?
  #Person2#: Buy more and get more special discount coupons.
  #Person1#: Can I get a discount coupon if I buy these goods?
  #Person2#: Of course You get a coupon for every 3 bags of sugar.
  #Person1#: But how much discount can I get if I use it to buy goods next time?
  #Person2#: 10 pence off if you use this coupon.
  #Person1#: Can I buy everything in the supermarket by it? .
  #Person2#: Yeah, you need to take advantage of it within its expiry date.
  #Person1#: How long can I keep it?
  #Person2#: The coupon can be used at least one year.
  #Person1#: I see. I will take 9 bags of sugar so that I can get 3 coupons.
  #Person2#: All right. I will get them for you.
summary: #Person2# answers #Person1#'s questions about getting special discount coupons and how to use them.
topic: discount coupons