Alex: David, would you like something to eat?
David: No, I'm full.
Alex: Do you want something to drink?
David: Yes, I'd like some coffee.
Alex: Sorry, I don't have any coffee.
David: That's OK. I'll have a glass of water.
Alex: A small glass, or a big one?
David : Small please.
Alex: Here you go.
David: Thanks.
Alex: You're welcome.