根据所给对话，填写适当内容，使其完整正确(每空词数不限)。

A: Hello, Dad, I have come back home. ?

B: I'm in the supermarket now. What's up?

A: It's a special day today, isn't it?

B. . It's Father's Day,

A: Do you have a plan?

B: Not yet.?

A: What about spending the day with my grandpa?

B: Good idea. What can I buy for him?

A: His sports shoes are too old.

B: OK. Then wait for me at home.

A: ?

B: I will be back in an hour.