Rescheduling or changing travel details can be checked on the trip details page before booking.
If your booking does not meet the conditions, the reschedule button will be disabled and you will not be able to proceed.
Refund eligibility is similar to rescheduling. You can check the conditions via the (!) icon in the trip details.
Example of reschedulable/refundable ticket (Check Mark)
Example of non-reschedulable/non-refundable ticket (Cross Mark)
Example of rescheduling/refund conditions icon (! Mark)