听力原文：

M: Wang Ming, can you help me book a one-way ticket to London?

B: Okay. But can you tell me when you are going to leave?

M: Next Wednesday.

B: Which flight do you want, Dad?

M: I have no idea. The earlier, the better.

B: What about Flight 855? It is the earliest one.

M: Book it for me, please.

B: Are you traveling first class or economy?

M: I’d like to travel first class.

B: How would you like to pay for the ticket?

M: Pay by WeChat.

B: Okay, your ticket is booked.

Question: Which flight will Wang Ming’s father take to go to London?

参考答案: 

He’ll take Flight 855 to go to London.