To buy movie tickets using the voice activated virtual personal assistant, all you need to do is to speak to Siri to tell her to buy you the tickets for the movie you want to see. When you mention that you want to buy tickets to a particular movie, the theater information and showtimes will be displayed. When you click on "purchase tickets" you are sent to the Fandango app to finish the transaction and if you don't have the app, you are prompted to install it. Siri will only purchase tickets for theaters in the United States and not every theater is participating in this feature. Those theaters that are compatible with Siri will be listed with a small movie ticket icon. It is possible that once the ticket is purchased, it would appear in Apple's new Passbook app.
Apple continues to add features to Siri. In iOS 6, the app started relaying more sports information, movie listings and started arranging restaurant reservations.
source: 9to5Mac via TechCrunch