Is there a limit on the number of times I can avail free cancellation?

Yes, you can avail the cancellation privilege once in 6 months from the day you become a Superstar and can cancel even a confirmed ticket up to 120 minutes prior to the showtime.

The option to cancel the transaction, if available, can be found under 'Purchase History' once you're logged in via the same Email address.

P.S. Superstar cancellations do not carry over and lapse at the end of every sixth month. Hence, the limit of one cancellation every six months.