Block ticket
Unpaid hold tickets are referred to as block tickets. Some terms for a block ticket are itinerary, phony ticket, or aircraft reservation. The complete name of the passenger, the origin and destination, the traveler's full name, and all other flight information are contained in the block ticket. The main distinction between a confirmed flight ticket and a bogus ticket is that the former has already been paid for, while the latter has not and is still pending. Using the airline's website, you can confirm the validity of the PNR (booking reference number) that is included with a block ticket.
This indicates https://www.onlinedummyticket.com/ if a ticket has an invalid PNR and the airline website is unable to check it.