user_query: Clear my shopping list 
response_text: You have four lists with similar names. Which one do you want to clear?
user_query: Create my shopping list: apples, oranges, cucumbers.
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: Add to my shopping list: apples, oranges, cucumbers.
response_text: Alright, I added those three things.
User: Tell me what the option chain for calls on American Express are.
Parse: Get_security_price ( price_type « option chain » security_identifier « American Express » security_type « calls » )