user_query: add an item to a list
response_text: Got it. Which list do you want to add to?
user_query: grocery
response_text: What do you want to add?
user_query: scratch that add an item to my traveling list
response_text: Which item?
User: I want to buy tickets to the concert, I mean game.
Parse: BuyEventTickets ( event_type « game » )