[lelemaster]

Those are basic codes, you'll need to adapt them to fit your script.

pawn Code:

new found = 0;
new passengerid;
for(new i = 0; i<MAX_PLAYERS; i++)
{
    if(GetPlayerVehicleID(playerid) == GetPlayerVehicleID(i) && GetPlayerVehicleSeat(i) == 1) // Seat 1 = co-driver
    {
        if(PlayerInfo[i][pJob] == yourjobid) // change my variable of PlayerInfo and pJob to fit your script
        {
            found = 1;
            passengerid = i;
            break;
        }
    }
}
if(found == 0) return SendClientMessage(playerid, -1, "You have no passenger who works with you.");
// use passengerid for the player id of the passenger.