What is the United Airlines change flight policy?

https://ideas.salesforce.com/s/idea/a0B8W00000QebZDUAZ/what-is-the-united-airlines-change-flight-policy

United offers a 24-hour return policy. If you need to cancel your flight, you can do so without charge within 24 hours of booking. You can cancel online or contact support at 𝟏*888*829*1467(𝕷𝖎𝖛𝖊-𝖕𝖊𝖗𝖘𝖔𝖓).