User: i need a movie
Assistant: what location?
User: reno
Assistant: what movie do you want?
User: star wars
Assistant: how many tickets
User: 4
Assistant: what time
User: 7:00 PM
Assistant: ok, I have 4 tickets for 7pm showing of star wars, do you want to purchase
User: you know what, I need to change the number of tickets to 2
Assistant: ok, 2 tickets for the 7pm showing, are you ready to purchase?