Why will the woman come late to the meeting? She has to wait for a delivery

Câu hỏi :

Question 21 - 23 refer to following paragraph:

M: Good evening, Annabelle. Will you be joining the other members of our team for dinner tonight? Our reservation is for 8 o’clock
W: I thought that you were all going out tomorrow night so that Frank could come
M: Well, we wanted to, but Frank said he couldn’t make it tomorrow either, so we decided to go out tonight instead
W: I see. In that case let me finish my work and I’ll meet you at 8:15
What time are dinner reservations?
21. Why will the woman come late to the meeting?