user_query: add apples and grapes to my shopping list 
response_text: OK, I added those two things.
user_query: No display my shopping list 
response_text: You have two things on that list.
user_query: Bring up list contains cheese 
response_text: You have eleven lists. Which one do you want to know about?
User: Purchase tickets to a rock concert in July, no, June in Los Angeles.
Parse: BuyEventTickets ( event_location « Los Angeles » event_time « June » event_type « rock concert » )