user_query: renive all items from my to-do list
response_text: You have two lists with similar names. Which one do you want to clear?
user_query: yes
response_text: It looks like that list is already empty.
user_query: I want to see all of my lists
response_text: You have quite a few lists.
user_query: clear all the lists
response_text: You have eleven lists. Which one do you want to clear?
user_query: create a to-do 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: What is yesterday's closing NASDAQ price, I mean today's?
Parse: Get_security_price ( price_type « closing » stock_market « NASDAQ » time « today » )