user_query: create a sport list
response_text: OK, I made a list called "Sport".
user_query: add soccer
response_text: Sure. Soccer on your list called "Sport". Anything else?
user_query: tennis
response_text: Sure. Tennis. Anything else?
user_query: Clear everything from the list.
response_text: You have eleven lists. Which one do you want to clear?
User: What is the price of AMZN of AMZN today?
Parse: Get_security_price ( security_identifier « AMZN » time « today » )