Cancellation of your flight if something comes up and you cannot make it to the flight can be done. The tickets need to be canceled from the medium through which it was booked, the official website, mobile app, or a third-party agency.
A refund can be requested against your cancellation. The refund amount and the charges of cancellation fees depend on your ticket. Tickets have different natures depending on the destination, the booking medium, and some more factors.
For the tickets which permit an appropriate refund for the corresponding cancellation, you can claim your refund via the official website, mobile app, or a third-party agency.