https://pressbooks.pub/ushistory1/chapter/name-change-rules-for-united-airlines-ticket-holders/
https://intercom.help/eraaaaaa/en/articles/10912462-ultimate-guide-united-airlines-name-change-essentials-what-every-traveler-should-know
https://pressbooks.pub/travelguidegov/chapter/common-united-ticket-name-change-problems-and-how-to-address-them-2/