User: Hello there, I want to book some movie tickets please.
Assistant: Welcome! What film do you have in mind?
User: I want to see The Rhythm Section.
Assistant: What showing?
User: Make the showing the 7:35 one.
Assistant: Good so far! Do you have any screening preferences?
User: Yes, I want an IMAX theater.
Assistant: OK. Which theater in particular?
User: The Landmark Theatres if possible.
Assistant: OK. Looking that up...one problem. It appears that Landmark Theaters doesn't have an IMAX theater.
User: Is it possible to substitute another theater?
Assistant: Yes.