Why did the man most likely miss the meeting?

M: Lisa, would it be possible for me to get a copy of the sales report? I couldn’t attend this morning’s meeting because my wisdom tooth was bothering me, so I ended up going to see my dentist.(47)
W: Okay, I’ll ask Joan to have the report ready for you.(48)Why don’t you drop by my office after lunch to pick it up?
M: Thanks, I really appreciate that. And, by the way, did you happen to see Mr. Lee this morning? I just dropped by his office, but he was not there. I really need his expert advice about a deal I am working on.
W: Oh, he showed up for the meeting, but I saw him leave in a hurry right after. He mentioned something about picking up Ms. Tan at the airport this morning.(49)She’s due back from Hong Kong today.