User: I need to get some tickets for tonight for a movie.
Assistant: Do you have a preference of movie?
User: The Invisible Man at the Century Stadium 25 and XD anytime after 3pm
Assistant: There are standard viewings at 7:30pm 9:00pm and 10:30pm this evening and an XD showing at 4:20pm
User: I'll take the 7:30 showing.
Assistant: How many tickets?
User: Four
Assistant: I have four tickets for The Invisible Man at the Century Stadium 25 and XD. This will be for the 7:30pm standard show. Is that correct?
User: Yes.
Assistant: May I confirm?
User: Sure.
Assistant: Very good. I have four tickets for The Invisible Man at the Century Stadium 25 and XD. This will be for the 7:30pm standard show. Is that correct?
User: No. I want to change it to the XD viewing at 4:20pm
Assistant: I have modified the purchase to four tickets for The Invisible Man at the Century Stadium 25 and XD. This will be for the 4:30pm XD show. Is that correct?