User: I need to purchase movie tickets for Twilight.
Assistant: When do you want to go?
User: Tonight please.
Assistant: Which theater?
User: Duplex.
Assistant: Is that the one on Main Street?
User: Yes.
Assistant: Ok. It is showing at 5:00, 6:00 and 7:30 PM.
User: I would like to see the 5:00 show.
Assistant: How many tickets do you need?