user_query: display my shopping list 
response_text: You have two things on that list.
user_query: I want to add items to my shopping list 
response_text: What do you want to add?
user_query: I want to add to my shopping list 
response_text: What do you want to add?
User: Put John's work phone, no home phone in my contacts.
Parse: Add_contact ( contact « John » label « home » )