Yes, with restrictions depending on fare class:
- Economy Light: no rebooking. Cancellation not possible (or refund of taxes only).
- Economy Basic: rebooking for a fee + fare difference. Cancellation not possible (or refund of taxes only).
- Economy Flex / Comfort / Business: rebooking free (fare difference only), including on the day of departure. Cancellation with full refund possible.
Go to manage booking, enter your PNR, and pick "Rebook" or "Cancel". After a disruption, rebooking is free in every fare — see "My flight is delayed".