user_query: add pop to my music list 
response_text: Got it, I added pop.
user_query: add to my music list 
response_text: You have two things on that list.
user_query: Get my list 
response_text: You have eleven lists. Which one do you want to know about?
User: See stock exchange prices from yesterday.
Parse: Get_security_price ( security_type « stock » time « yesterday » )