Where does this dialogue most probably take place?

M: Hello, Mary! So glad to be on business trip with you this time!
W: Oh, John, me too. Secretary Shirley has sent me our trip plan, we have to go to 4 places in 7 days.
M: That means we will spend most time of the seven days on the way.
W: So it must be tiring.
M: What’s the weather like in those cities?
W: Those cities are in the south, so it will be very hot.
M: When will we start?
W: Oh, our flight to Hangzhou takes off at 11:35 in the morning this Friday, but we have to check in 2 hours before, so how about we meeting at the airport at 9 o’clock?
M: No problem.
W: The flight will take 2 hours, and 1 have made the hotel room reservation at 3 o’clock in the afternoon.
M: En, then we will have enough time to prepare, the banquet meeting will start in the evening. We can enjoy a very nice night!
W: But later it is not comfortable! On Saturday morning we will fly to Changsha, and after the meeting in Changsha, we will take a train to Guangzhou at night on the same day.
M: So when we get to Guangzhou it will be August 14.
W: No, we will take a high-speed train, so we will arrive in Guangzhou at the late night of August 13. Then after we have the meeting in Shenzhen, we will fly back to Beijing on August 15, just 7 days.
M: I got it, please send me a detailed travel plan, now I will go to the meeting room to have a meeting with the sales team. See you!
W: OK, see you!