United Airlines provide 24 hour cancellation policy (+π-π΄π²π²-π³π―π΄-π¬π²π΄π΅) (ota) if you book a flight at least 7 day before departure and cancel within 24 hour of Booking you will get full refund without any cancellation fee
https://www.nairaland.com/8259422/faq-what-cancellation-policy-united