User: Get me tickets for star wars in cincinnati
Assistant: ok what time would you like to go
User: 7 or 8pm
Assistant: And what size would you like for the screen
User: Imax if they have it
Assistant: Ok, i see options for a 7pm imax and an 8 pm imax
User: pick the 7 pm one
Assistant: ok, how many tickets do you want
User: just 1
Assistant: all right I have you a ticket for 7pm imax for 1, should i buy it
User: yes
Assistant: ok, your ticket for 7pm imax for 1 has been bought
User: can you change the ticket
Assistant: i can, what would you like to change
User: can you change it to 3d
Assistant: do you still want it at 7pm for 1
User: yes
Assistant: ok, i see a spot for 7pm for 1 for 3d. should I buy it