First of all, if you lose something, you should go to the lost and found office at the airport. Generally, at the end of the flight, the flight attendant will hand it over to the ground crew. You can report your general situation when you go. Generally, there is no problem, and no one will take your things without permission. No company will ask you what you lost, because so many people on the plane don't know who it is. Just report to the ground according to the approximate seat number and location. Go and ask.