A、Buying air tickets for their travel. B、An automatic ticket-selling machine. C、Different types of tickets. D、A new type of bank

M: Have you ever heard of a machine that sells tickets?
W: Yes. I’ve seen them in bus and subway stations.
M: But I mean a single machine that sells all kinds of tickets, located in public areas just like an ATM.
W: What do you mean by "all kinds of tickets?"
M: Air tickets, bus tickets, subway tickets, railway tickets, tickets for tourist attractions, and so on.
W: Well, that sounds fantastic! But is it easy to use?
M: Very simple. Yesterday I bought my air ticket for my trip to Shanghai from such a machine.
W: How did you do it?
M: Well, I first pushed the "Air Ticket" button, typed in my destination and the time I wanted for my flight, and several choices appeared on the screen.
W: What kind of choices?
M: Flight numbers from different airlines that were suitable for me.
W: I see. What did you do then?
M: I made my choice of flight and put in my bank card, and guess what had happened?
W: What?
M: In less than a minute, I got my air ticket.
Q6. What are the two speakers talking about?