补全对话

A. Can I book (预订) the rooms now? B. Did you go anywhere interesting? C. Do you have a good idea? D. How can we get there? E. How was your vacation? F. This is Helen speaking. G. Where will you go on vacation?

A: Hello! May I speak to Helen, please?

B: Hello! Who's that?

A: Susan speaking.

B: I am not sure.

A: Yes, I do. What about going to Chengdu together?

B: Good idea.

A: By train.

B: OK. Two double rooms, please.