Flight Ticket Booking Service

Unpaid hold tickets are called block tickets. Another name for a block ticket is a flight reservation, itinerary, or dummy ticket. The whole name of the passenger, the origin and destination, the traveler's complete name, and all other flight information are included in the block ticket. Confirmed flight tickets and dummy flight tickets essentially look the same; the main distinction is that although the payment for the confirmed ticket has already been made, the payment for the dummy ticket has not and is still on hold. A block ticket is always accompanied by a valid PNR (booking reference number), which you may check on the airline's website.
If a ticket have a PNR which is invalid and can't be verified at airline website that means it isfake block ticket.