@aanyachinda
The cancellation policy of Singapore Airlines differs depending on the kind of paid fare. If a flight is cancelled or considerably delayed, travellers may be eligible for a refund or the chance to switch to a later trip for the majority of costs. If a customer cancels their reservation, they may incur cancellation costs and fare discrepancies.
https://www.airlinesmap.com/singapore-airlines-cancellation-and-reimbursement