KLM offers a convenient 24-hour cancellation policy ????-????????????-????????????-???????????????? . If you cancel your flight within 24 hours of making the reservation and your departure is scheduled to occur more than seven days later ????-????????????-????????????-???????????????? , you will receive a full refund with no cancellation fees. To manage your booking or get additional support, reach out to United Airlines customer service at ????-????????????-????????????-???????????????? .