This would mean that now and then a mission to collect and return a ship to a certain station is offered.
One variation would be that the owner has a friend/s guarding the vessel from scavengers, so you would be paid to collect the vessel and return it to wherever the owner has ended up, most likely just the main station but sometimes elsewhere due to business or other occurance. This would likely be a larger vessel with much expensive cargo that would be lost to the insurance vultures.
Another would be an emergency call out for an unguarded vessel, presumably with something valuable or sentimental on board. This would be a high paying rush job (torus + injector all the way to be the first) at which other tow capable vessels would also hurry, with a chance that the craft has already been destroyed for remaining cargo. This ship would likely be any size and you could be returning anything from a wedding ring (or other species ceremonial symbol),passenger who's capsule is trapped amongst internal damage(possible thankful payout, lucky if they're rich!), to a child/pet/life-long-family-droid that was hiding or trapped outside of the escape capsule during the panic of attack.
These would usually be offered in the current or the next system, but rare and extremely well paid long hauls are possible for those who's sentimental value is *for X reason* the ship itself.
Sorry for throwing ideas at you
