Write the next sentence in the following story.

How to fly for free
Agree to be bumped.
Major airlines tend to overbook their flights to compensate for passengers who may not show up. If more passengers show up than can fit on the airplane, the airline will ask for volunteers to take a different flight.

Options are: + If some aren't able, you can still be bumped up to the next boarding box. Some airlines will even send ahead tickets to balance fares if you're traveling to paris or other paris venues.. + Contact other passengers to see if they would be happy to share their flight information with you. Make sure to bring along a map of the airport and any conditions you observed.. + To show their gratitude, they usually offer travel vouchers you can use on future flights. Just wait for an airline representative to announce that your flight has been overbooked, and then head to the counter to ask about being bumped.. + A big part of getting to where you are headed can be delegated to an airline that doesn't seem to want to bump anyone. However, saying " no " to expenses or flights in anticipation of weighing in could lead to unforeseen expenses or fees... The answer should be
To show their gratitude, they usually offer travel vouchers you can use on future flights. Just wait for an airline representative to announce that your flight has been overbooked, and then head to the counter to ask about being bumped.