[NeRoSiS]

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
new name;
if(vehicleid == 500 && 501)
{
GetPlayerName(playerid, name, sizeof(name));
if(name == Thomas_Coron)
{
return 1;
}else RemovePlayerFromVehicle(playerid);
}
return 1;
}


You can sort the indentation out, I'v never used getplayername before but in theory that should work.