https://intercom.help/ame-f9424eff7096/en/articles/10838831-can-you-change-a-%F0%9D%90%8B%F0%9D%90%AE%F0%9D%90%9F%F0%9D%90%AD%F0%9D%90%A1%F0%9D%90%9A%F0%9D%90%A7%F0%9D%90%AC%F0%9D%90%9A-flight-for-free-__passenger-rights-for-free-flight__