How do virtual assistants like Siri, Alexa, Bixby, Cortana, and Google assistant work? I have found some things searching how Google assistant and Siri work, and this book on Google books: using Google scholar https://books.google.com/books?hl=en&lr=&id=H7daEAAAQBAJ&oi=fnd&pg=PP12&dq=info:OJRgUdIalv
