User: I'm interested in seeing a movie tonight.
Assistant: Ok, what movie do you want to see?
User: I want to see Heat.
Assistant: Ok, where do you want to see it at?
User: I'd like to see it at the Ballston AMC.
Assistant: Ok, what time do you want to see it at?
User: I want to watch it at 9:00 PM.
Assistant: Ok, how many tickets do you need?
User: I need 3 tickets please.
Assistant: What type of screen do you want to see it on?
User: I'd like to see it on a 3D screen.
Assistant: Ok, just to confirm, you want three tickets to see Heat at the Ballston AMC in 3D at 9:00 PM, is this correct?
User: Actually, I changed my mind.
Assistant: Ok, what change would you like to make?