https://www.devex.com/people/does-lufthansa-allow-flight-changes-2460795

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https://www.devex.com/people/can-you-cancel-with-expedia-and-get-a-refund-2454613

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https://knowt.com/note/06e8d8d5-1656-40de-bad0-3fe449458453/What-is-the-24-hour-cancellation-policy-

https://onefoundation1.microsoftcrmportals.com/forums/general-discussion/3de5b932-75d2-ef11-95f5-000d3a7a0443