Why did John apologize to Ms. Jones?

W. I heard that John quit his job this morning.
M: How do you know that?
W: I overheard him talking to Ms. Jones when I passed by the office. She was very annoyed about it.
M: What did John say to her?
W: He apologized again and again to Ms. Jones for not notifying her earlier.

M: I still want to buy those tickets for tomorrow’s concert.
W: They may be gone by now. They’ve been on sale for a week and the singer is very popular.
M: It’s bad news.