According to
Xiamen Airlines Cancelation Policy, if your plan is interrupted, you can choose to rebook your flight or request a full refund from the airline. You will receive priority assistance if your flight is due to depart within the next 72 hours. To request rebooking or a refund, you can use the online support request form.
If you purchase your ticket directly from Xiamen Airlines, you can cancel your Xiamen Airlines ticket online to get a refund of a refundable fare.