answer: #Person1# comes for a radio he bought yesterday that doesn't work. He can't find the receipt but manages to offer the cheque stub. The manager checks the radio and finds that it's because #Person1# didn't read the instructions, he didn't move the switch onto the right position.
documents: #Person1#: Good morning, Miss. I'd like to speak to the manager.
  #Person2#: I am the manager, Sir. How can I help you?
  #Person1#: Oh, really? It's this radio. It doesn't work.
  #Person2#: Mm... did you buy it here?
  #Person1#: What do you mean? Of course I bought it here. Look, you switch it on and nothing happens.
  #Person2#: Could I see your receipt?
  #Person1#: Receipt? I haven't got one.
  #Person2#: Oh, you should have got a receipt when you bought it.
  #Person1#: I perhaps did. I must have thrown it away.
  #Person2#: Ah, well, have you got any other proof of purchase, the guarantee, for example?
  #Person1#: No. It must have been in the box. I threw that away, too.
  #Person2#: Oh, dear. You really ought to have kept it. We need to know the exact date of purchase.
  #Person1#: What? I only bought it yesterday! That young man over there served me. Oh, I paid by cheque. I've got the cheque stub.
  #Person2#: That's all right then. Did you check the radio before you left the shop?
  #Person1#: Check it? No, it was in the box. I hoped it would work. It wasn't a cheap radio. It's a good make.
  #Person2#: You should have checked it.
  #Person1#: Come on! Do not tell me what I should have done, and do something! Either give me my money back or give me another raido.
  #Person2#: There's no need to get aggressive, Sir. Let me look at it... mm... you see this little switch on the back?
  #Person1#: Yes?
  #Person2#: It's on 'main', and it should be on 'battery'. You really should have read the instructions.
  #Person1#: Oh!