HOUSTON (AP) — United Airlines has apologized and given a $500 travel voucher to a passenger who accused the airline of giving her first-class seat to U.S. Rep. Sheila Jackson Lee, a Houston Democrat.

An airline spokeswoman said Monday that its internal systems show the passenger, Jean-Marie Simon, canceled her Dec. 18 seat from Houston to Washington, D.C. after a weather delay.

Simon denies that she canceled the flight. She was given a seat in Economy Plus on the flight, and told the Houston Chronicle she saw Jackson Lee sitting in the seat that was assigned to her.

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United says it upgraded Jackson Lee automatically and not because she was a member of Congress. The congresswoman says in a statement that she didn't ask for anything "exceptional or out of the ordinary."