Why can’t they meet on Thursday?

M: I’d like to talk to you about our next building project. Can you fix a meeting for this week? What about Thursday?
W: Well, I’ m sorry. I’ ve been extremely busy this week. I’ ll be at a meeting all day on Thursday. And I’ m going out of town on Friday. Is Wednesday all right?

M: Mrs. Anderson, you must have gained a deep insight into the problems of married couples.
W: Yes, I think I have.
M: What do you consider to be the most important problems?