Question

What will you do if you miss your plane?

or
What are you going to do if you miss your plane?

Answer 1

I will try to book another flight, that is available as soon as possible. If I cannot book a flight at the moment, I will contact them to try and get a refund of my money. If neither is an option, I will speak to the people at the airport to see what is the best option for me.

Answer 2

I will take another flight by complaining