Why did the woman make a trip to Boston?

M: Aren’t you supposed to be in Boston right now? I thought you left to attend the business conference yesterday?(62)
W: I did, and I came back late last night. It was only a day affair, and I took the last flight out because I have a meeting with Mr. Jones this afternoon.(63)I could have taken a flight out this morning, but I have some things to prepare before I meet with him.(64)
M: You know, if I had known that it was only a day affair, I would have taken the trip with you. I also have a meeting with a very important client today, and that’s why I didn’t make the trip.
W: You should’ve talked to me about it. We could’ve made the trip together.