If you want a different perosn to use a return portion of your restricted ticket, the only way to do this is to have the original passenger check in and give the boarding pass to the person who will be boarding the plane. This would not work on international flights becuase airlines sometimes recheck passenger ID when you board. Be advised that if something happens to the plane (it crashes, gets rerouted to a different city . . . . ) you may not get the same compensation as the other passengers.