???????????????????????? Airlines has a 24-hour risk-free cancellation Policy by calling1-866-884-3315{US} / +44(800-208-1075){UK}. You can cancel your flight within 24 hours of booking for a full refund, as long as it was booked at least ???? days in advance. https://community.riverbed.com/helpcenter/s/question/0D5VM00000SUCkZ0AX/needrefund-18668843315-what-is-the-cancellation-policy-on-united-livesupport