user_query: add an item to a list
response_text: OK. Which list do you want to add to?
user_query: movies
response_text: What do you want to add?
user_query: nevermind add to vacation list instead
response_text: What do you want to add?
User: Take a picture with the back camera, actually, the front camera.
Parse: Take_photo ( instrument « front camera » )