A: Can I help you?
B: Yes. I'd like to buy a blackboard. Can you show me one?
A: Sure.
B: It looks nice, but it's too big.
A: Sorry, the smaller ones are sold out. Look at this whiteboard.
B: Oh, it's just right.
A: $50.
B: $50?
A: Well, I'm afraid it's the cheapest one.
B: OK.
A: Thank you.
