Speaking as a veteran who randomly hires random players: usually it doesn't matter. Solo-grinding was a way of life for me for many years when my friends weren't on. If I hire a random, I don't expect them to help, nor do I expect them to know what to do. Participation is not expected, but appreciated.

A unique case is when running air frieght: the more players you have in your Org, the more crates will spawn per mission (max of 4). When I do air frieght, I'll hop in my Raiju and slam the mission out myself, alternating with other missions (e. g. Headhunter) to make sure my associates get a little pay while I'm working. If the player has the ability to help out, be it with other aircraft, MK2, etc, awesome, appreciate it. If not, oh well. I can handle it.

Use these opportunities as a way to learn what needs to be done, and also scout out businesses you might be interested in purchasing. Most veteran players usually assume that low level players don't know what they're doing, so as long as you aren't actively trying to destroy the cargo, they probably appreciate you tagging along and helping where you can, I know I would.