The cancellation of bookings is subject to period of time of bookings.

So, if you have cancellation in your mind be hurry to do so.

I have some data for you to know charge for cancellation:

Change up to 8 weeks prior to departure = Zero charge
8 to 4 weeks prior to departure = 25% of the total fare
4 to 2 weeks prior to departure = 50% of the total fare
Less than 2 weeks prior to departure = 100% of the total fare