User: need Star Wars tickets for tonight
Assistant: what time?
User: 6:40
Assistant: how many tickets & what theater?
User: 4 tickets, Ohio
Assistant: ok
User: thanks
Assistant: 4 tickets, Star Wars XD 6:40
User: yes
Assistant: ok
User: changed my mind, how about the 9:30 showing?
Assistant: 4 tickets still?
User: yes
Assistant: 4 tickets Star Wars 9:30