Apple said Monday that it was overhauling its longtime virtual assistant, Siri, by adding artificial intelligence features and changing its name to Siri AI. The iPhone maker announced the changes at its annual technology meeting, the Worldwide Developers Conference. Company executives demonstrated using the virtual assistant for various everyday tasks, such as looking up the date of a concert, shopping for a backpack or planning a soccer watch party. It appeared to be the biggest revamp of Siri