阅读对话，回答问题。

Lynn: Mum, let's go on a trip this Saturday, OK?

Mum: No. Your grandmother will come to our house.

Lynn: That's great！May we go to the airport?

Mum: Sure. We will take a bus to the airport.

Lynn: May we take a car? A car is fast.

Mum: But I can't drive a car.

Lynn: We can get my dad to drive.

Mum: OK!

Lynn: When will my grandmother arrive?

Mum: She will arrive at 2:00 in the morning on May the first.