Quite often, a dummy ticket or a flight reservation is often misunderstood in terms of its use. The answer really lies on where you got it and how you will use it. Let us, a travel company answer your question.
Let a legitimate travel agency provide you a detailed explanation what makes a Dummy Ticket or a Flight Reservation illegal and legal. But foremost, Dummy Ticket is a flight reservation of a round trip airline ticket from and to your home country; the legality depends on its use. It is a document provided by airline websites and by a travel agency.