KLM's 24-hour policy permits passengers to modify or rescind their reservations without incurring any penalties within 24 hours of their reserved flight+𝟰𝟰"𝟮𝙊"𝟴𝟭𝟮𝟰"𝙊𝟲𝟲𝟲 & +(𝟠𝟠𝟠)//𝟵𝟲𝟯//1444. To make any modifications to your booking within the 24-hour period, please contact KLM customer service for assistance.