Sometimes, the first and last names might be switched or listed in the wrong order. For example, a booking may show the last name in the first name field and the first name in the last name field. United Airlines is generally flexible in correcting this, as long as the change is not more significant than a simple inversion. This type of adjustment can typically be done without much hassle and, like other simple name corrections, may require a form of ID to verify the correct order of names.