User: I need movie tickets for tonight.
Assistant: To which movie?
User: Birds of Prey.
Assistant: At which theater?
User: AMC South Barrington.
Assistant: What showtime are you interested in?
User: After 8:00 PM.
Assistant: What format are you interested in?
User: Standard format is fine.
Assistant: How many tickets?
User: I need 4 tickets.
Assistant: There is a 9:30 PM showing.
User: Actually, I think we are interested in seeing it in IMAX.
Assistant: So you want to change the format to IMAX?
User: Correct, is there a showtime after 8:00 PM for that?
Assistant: There is a 10:15 PM showing in IMAX.