function return..

im not sure what to return for this function?

TourBus& TourBus::startTheTour() const
{
if (busSizeNumber != 4)
{
cout << "Cannot start the tour, the bus is not fully boarded!" << endl;
}
else {
cout << "Starting the tour...." << endl;
cout << "Passenger List:" << endl;
cout << "|Row | Passenger Name | Num |" << endl;
cout << "+----+------------------------------------------+-----+" << endl;
ticket->display();
cout << "+----+------------------------------------------+-----+" << endl;
}
return .......;
}

}
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