Go to

https://www.airhelp.com/

Since 2013, AirHelp has helped more than 16 million passengers understand their rights and claim ​up​ to €600 in compensation for delayed or canceled flights. All they need to do is to submit their flight details — if they are eligible, AirHelp will handle the claim process on their behalf for a 35% fee (or 50% if legal procedures are needed). If we can't get them the money, the bill is on us!