https://support.zendesk.com/hc/en-us/community/posts/7559199601050–FaQs-1-855-583-0122-United-flight-change-Directly-help

https://support.zendesk.com/hc/en-us/community/posts/7559199601050--FaQs-1-855-583-0122-United-flight-change-Directly-help