I wonder what would happen if people launching later decided to pick up the people who launched earlier. Like they’re headed towards the same destination anyway

I wonder what would happen if people launching later decided to pick up the people who launched earlier. Like they’re headed towards the same destination anyway, following the same general intergalactic line. Sure finding a ship in space is like finding a needle in a vast vacuum but maybe their ships would emit enough radiation for their “scent” to be traceable. And if picking up other traveler isn’t important enough to warrant a pit stop, maybe the ships that left earlier would have valuable information for the ships who leave later on.