A Dummy ticket, also known as a flight reservation or itinerary, is a hold ticket that has not yet been issued. These tickets include details like departure and arrival times, destination, and the traveler's name. While they resemble confirmed tickets, the key difference is that confirmed tickets have been paid for, whereas dummy tickets are on hold. It’s important to remember that a valid PNR allows verification on the airline's website, while an invalid PNR indicates a fake ticket, making the distinction of a dummy ticket crucial for travelers.