How do I get a Refund from United

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https://data.nola.gov/nominate/515103
The United Airlines cancellation policy delivers its flyers with a 24 hour risk-free window, under which passengers can cancel their bookings for free and will be eligible for a complete refund, regardless of fare type. However, if you cancel your flight after 24 hours, then you have to pay a certain amount as a United Airlines cancel flight fee.