In essence, dummy tickets are tickets that haven't been distributed yet. The related live PNR is available on the airline's web page. You can verify it using the Manage My Booking or Manage My Trip tools on the airline's website. It is useful for short-term purposes, such as proving a return or applying for a visa. You may buy a dummytickets for about INR 800 or $10 in 10 minutes. https://dummyhotelbooking.com/