user_query: I found tape., remove tape from the list
response_text: I couldn't find I found tape.
user_query: also add ribbons
response_text: Sure, I added ribbons.
user_query: add tape and scissors to the Christmas list
response_text: Sure, I added tape and scissors.
User: I want to buy tickets to the game, no concert.
Parse: BuyEventTickets ( event_type « concert » )