KLM's 24-hour rule allows customers to cancel a flight booking for a full refund by phone at "❤✌1#203~376~3406🙌🤳👍 OR ❤✌1#877~656~0930🙌🤳👍 (UK)" within 24 hours of purchase, as long as the reservation was made at least 7 days before the flight's departure date.
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