Boy: I'm afraid the touch screen is broken. Nothing happens when I touch it.
Father: Oh dear. Has it got a guarantee?
Boy: Yes, for a year, so I can take it back to the phone shop.
Shop assistant: Hi, can I help you?
Boy: Yes. This touch screen doesn't work.
Shop assistant: Have you got the receipt?
Boy: Yes, I have, and I've got the guarantee too.
Shop assistant: OK. We can't give you a refund, but we can exchange / replace it.
Boy: OK. Thank you.