User: I need to purchase movie tickets
Assistant: okay, do you need help picking a movie?
User: no, we want to see 1917
Assistant: do you have a preferred screening type?
User: standard is fine
Assistant: do you have a preferred theater?
User: yeah, amc jersey gardens
Assistant: Would you like to see the movie today?
User: yes
Assistant: great, the movie showtimes are 6:45 PM and 9:00 PM
User: do they have imax too?
Assistant: Yes, the 9:00 PM is in imax
User: please change it to imax and book the 9:00 pm showing
Assistant: okay, give me a moment to make the change
User: thanks
Assistant: how many tickets do you need?