I love language, Introductory flight, Air experience flight (what's the difference?), Trial lesson.
So a Introductory flight is one where you trust the reputation of your company to use a PPL to fly a stranger and hope they might come back and learn.
Air experience, much the same thing but perhaps a term nicked from the RAF when cadets were taken up for ten minute ride and shown some basic aeros to try engendered some interest to join the air force, and fill a sick bag.
And Trial lesson, advertise a one hour lesson and only fly 20 minutes, to look competitive to the school down the road that gives a full hours flying, for twice the price and of course pay the instructor for the 20 minute flight.