A、Making a travel to France. B、Posting a letter. C、Reserving airline tickets. D、Booking train tickets. C男士给环球旅行社打电话预订机票，针对航班号、费用

W: Globe Travel here. Can I help you?
M: Yes,(18)(20)I’d like to make a flight reservation for the 25th of this month.
W: OK. Where are you going?
M: Well. I’m heading for Paris, France.
W: OK. Let me check which lines are available. When do you intend to return, please?
M: Uh, well, I’d like to ca :ch a return flight on the 30th. Oh, and I’d like the cheapest flight if it is possible.
W: OK. Let me see.(20)Well, the price for the flight is almost half the price you would pay if you leave the day before.
M:(20)Oh, then I’ll go with the cheaper flight. By the way, how much is it?
W: It’s only $890.
M: Alright. Well, I’ll go with that.
W: OK.(19)That’s Flight 1090 from Salt Lake City to New York, Kennedy Airport, shifting to Flight 70 from Kennedy to Paris.
M: And what are the departure and arrival times for each of these flights?
W:(20)It leaves Salt Lake City at 9:00 a.m. , and arrives in New York at 3:00 p.m. Then you’ll transfer to Flight 70 at 4:55 p.m. and arrive in Paris at 7:30 a.m. the next day.
M: Alright. And, uh, I’d like to request a vegetarian meal.
W: Sure, no problem. And could I have your name please?
18. What is the conversation mainly about?
19. What are the two flights the man will take?
20. When will the man start off from Salt Lake City?