听力原文：W: Can I help you? M: Sure. I'd like to book an airline ticket here. W: Which airlines do you prefer? M: I don't have any particular airlines in mind. Any one safe, reliable and reasonable is O. K. with me. W: Where is your destination? M: London. W: From here? M: Yes, from Norfolk International to London Heathrow Airport. W: When would you like to leave? M: Friday, the coming Friday. W: There're dozen flights to London. Which do you prefer, morning, afternoon or night flight? M: Is there any difference in price? W: Yes. Generally speaking, the night flight is cheaper. Are you taking single or return? M: Return. I'll be back Monday evening. W: And economy class? M: Yes. W: You'll have our weekend bargain price. It's ＄480. M: That's acceptable. Which airlines? W: The US Air and the British Airways. M: You mean I'll have to change. W: Yes, at Dullas Airport, Washington D. C. M: What time? W: You leave Norfolk International at 9:55 p. m and Dullas at 11:50 p. m. M: How long does the trip take? W: About 5 hours. You'll be there in the morning. M: That's O. K with me. W: Can I have your name please? M: John Smith. W: John Smith. Shall I write your tickets now? M: Wait a minute. How much luggage can I take onto the plane? I've got some documents and have to take good care of them. W: It's 5 kilos. You may just take your documents with you and leave the other luggage to the airlines. M: That's a good idea. W: You'll return from Heathrow at 6 p.m. Monday and arrive at Dullas 7 p.m. Is that all right? M: That's perfect. Please make my tickets O. K. W: Sure. You don't have to have your return ticket confirmed. M: Do you accept the credit card? W: Yes. Please sign your name here. Thank you. Here you are, credit card, tickets and receipt. M: I appreciate it. W: You're welcome. Where is the man going?