answer: #Person2# bought a CD player and asks #Person1# for the information about refund.
documents: #Person1#: Is there anything else that you would like to buy?
  #Person2#: No, thank you. I guess that's it. By the way, in case there's a flaw in this CD player. Can I return it?
  #Person1#: Yes. But you must return it within 30 days.
  #Person2#: Is there a charge for that?I know other stores have a restocking fee.
  #Person1#: There will be no charge at all.
  #Person2#: I'm glad to hear that.
  #Person1#: However,you must show us the receipt. Could you sign it here, please?
  #Person2#: OK.
  #Person1#: All right. Keep your receipt. If something comes up. you can show it to us and We'll give you a refund.
  #Person2#: Thanks. I'll put it in a safe place.