user_query: delete all lists
response_text: You have eleven lists. Which one do you want to delete?
user_query: make a list
response_text: OK, what do you want to call it?
user_query: food
response_text: Sure, I made a list called "Food".
User: How did GOOG do on the er market today?
Parse: Get_security_price ( security_identifier « GOOG » time « today » )