根据对话内容，从下面方框中选出恰当的句子补全对话。

A: Hello. This is Airport Ticket Office. May I help you?

B: .

A: Let me have a look. Er, Ok. We'll have a Boeing 868 leaving at 10'clock tomorrow morning.

B: .

A: CA2556.

B: 7.

A: It's 500 dollars.

B: .

A: Sure. By the way, could I have your name, please?

B: John Smith.

A: OK, Mr. Smith. One ticket for Paris of 10 o'clock tomorrow morning, right?

B: That's right. Thanks.

A: Bye.

B: Bye - bye.

A. How much is the ticket? B. It's our pleasure. C. Hello. Can I fly to Paris tomorrow? D. May I book a ticket now, please? E. And what's the flight number, please?