You will be responsible for the flight cancellation fee if your ticket is canceled more than 24 hours after you made your reservation with Qatar Airlines. A cancellation fee from Qatar Airways will be assessed in accordance with the terms of your ticket, including whether it is refundable or not. A cancellation fee could cost as much as $150, depending on the type of fare you are using. Should you want to cancel your ticket offline, the airline will charge you extra.
https://flightcancellationpoli....cy.com/qatar-airways

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Qatar Airways Cancellation, Fees and Refund | Policy

You can get a full refund of your Qatar Airways flight if you cancel your flight within 24 hours of booking, according to Qatar Airways cancellation policy.