问题详情

Speaker A: Good morning. Id like to book two return air tickets from Beijing to New York, please. Speaker B: ______

A．Excuse me, who are you travelling with？

B．Good morning. What can I do for you？

C．I"m sorry, but there are no tickets left for tomorrow.

D．Certainly. When are you travelling？

请帮忙给出正确答案和分析，谢谢！