If there's a change in your flight booking, our services team is available to help you. We can make changes to your booking for free. Please note that there may be limits on the number of changes and cancellations you're allowed to make. As a Business or First Class passenger, you are entitled to change the date or time of your reservation free of charge within 24 hours of booking your ticket. visit here : https://www.bookaflightdeals.com/blog/klm-change-flight/