The PNR code is the booking number of your ticket. It consists of numbers or letters. With this number, you can print out your ticket, make changes and cancellations. In short, it is the easiest way to access your ticket information. The PNR code is sent to you via e-mail and SMS when you buy tickets from the Internet.
You can click here to query your ticket with your PNR number, make an exchange and cancel transaction.