User: Find me movie tickets for Knives Out at AMC Showplace 14
Assistant: There are tickets available for 6pm, 6:30pm, 7pm, and 11:30pm. Which showtime would you like?
User: Buy me tickets for the 6:30pm showtime.
Assistant: Alright I am purchasing tickets for the 6:30pm showtime. There are two ticket types available: IMAX 3D and standard. Which ticket type would you like?
User: Buy me the standard ticket type.
Assistant: Alright, purchasing the standard ticket type for the 6:30pm showtime at AMC Showplace 14. Is this correct?
User: Yes.
Assistant: Okay, I'm sending these tickets to your email address.
User: Change ticket type to IMAX 3D.
Assistant: Okay. I'm changing the ticket type to IMAX 3D for the 6:30pm showtime at AMC Showplace 14. Is this correct?
User: Yes.
Assistant: Okay. I've cancelled your previous purchase for standard tickets at AMC Showplace 14 for the 6:30pm showtime. I have purchased the tickets for the 6:30pm IMAX 3D showtime at AMC Showplace 14. Is this correct?