user_query: create a meat list
response_text: Sure, I made a list called "Meat".
user_query: add lamp
response_text: OK. Lamp on your list called "Meat". Anything else?
user_query: chicken
response_text: OK. Chicken. Anything else?
user_query: Delete all items on Meat
response_text: You have eleven lists. Which one do you want to clear?
User: Purchase tickets  tickets to a rock concert in October in San Francisco
Parse: BuyEventTickets ( event_location « San Francisco » event_time « October » event_type « rock concert » )