根据上下文，用合适的句子补全对话。

A: Hi, Jane! Can you go to the zoo with me this Saturday?

B:     1    .

A: That's too bad. What are you doing?

B: I'm having a party this Saturday.    2    ?

A: Yes, I'd love to. Who will come to the party?

B: Well, some friends. Could you come to help cook?

A:     3    ! I'm good at cooking.

B: Really? That's great!

A:     4    ?

B: How about 4:00 in the afternoon? The party starts at 6:00.

A: No problem.     5    .

B: You're welcome.