A、In an airplane. B、In a hotel. C、In a restaurant. D、In a store. B根据对话中男士提到的no rooms和女士提到That man had a reservation(那位男士有预约)可推断出

M: I meet with a sticky problem. I find it so hard to make the decision. That nearly drives me crazy.
W:Well, don’t worry. Come on, I am all ears.
Q: What does the woman mean?

M: What! Ten minutes ago you told me there were no rooms. You just gave one to that man!
W: You don’t seem to understand, sir. That man had a reservation.
Q: Where is this conversation most probably taking place?