User: I'd like to book some movie tickets in advance.
Assistant: Sure. How many were you looking to book?
User: Two.
Assistant: Which movie is this for?
User: The Invisible Man.
Assistant: Okay. When is this for?
User: This Saturday would be great.
Assistant: Do you have a theater in mind?
User: Yeah, the Philadelphia Mills AMC.
Assistant: Which time do you want to see it at?
User: Some time in the afternoon. What are the show times for the afternoon?
Assistant: There's a 1:50 PM showing and a 4:20 PM showing.
User: The 1:50 PM showing would be perfect.
Assistant: Two tickets for the 1:50 PM showing of the Invisible Man at the Philadelphia Mills AMC for this Saturday.
User: You know what? I want to change the number of tickets.
Assistant: Sure. How many?