user_query: create a shopping list
response_text: Sorry, it looks like you already have a list with that name. Do you still want to make a new one?
user_query: no
response_text: Alright, nothing's been changed.
user_query: add books
response_text: Alright, I added books.
user_query: add food
response_text: OK. Food on your list called "Shopping". Anything else?
User: Show me the stock price of CCL on Ameritrade.
Parse: Get_security_price ( provider « Ameritrade » security_identifier « CCL » security_type « stock » )