User: I need movie tickets
Assistant: What movie do you want to see?
User: Downhill
Assistant: And how many tickets do you need?
User: 4
Assistant: What theater and showtime?
User: Regal Northampton and the 3:45 showing on the 20th.
Assistant: So would you like me to purchase 4 tickets for Downhill at Regal Northampton for 3:45 on the 20th.
User: Wait. No. I need to make a change
Assistant: What would you like to change?
User: I want to switch to a later showtime. Are there other times?
Assistant: There's a 6:50 showing and a 9:25 showing