It is acceptable to use dummy tickets when applying for a visa. These are bookings or reservations made by travel agents and airlines.
Why are dummy tickets acceptable? They are affordable, refundable, or changeable, and a quick and easy way to obtain a visa clearance.
How do dummy tickets operate?
Since a dummy ticket is a real reservation for a flight, it is placed on hold until payment is received. An airline verifiable PNR (passenger name record) code is present on a dummy ticket.
You or the embassy can confirm the ticket's validity with the PNR number. Where are dummy tickets available?
Travel agents and airlines might provide you with dummy tickets.