user_query: christmas list
response_text: You have one thing on that list.
user_query: add ice cram
response_text: Got it, I added ice cream.
user_query: nevermind that. add to grocery list instead
response_text: Sure, I changed the list title to "Grocery."
user_query: add ice cream to it
response_text: Alright. Ice cream on your list called "Grocery". Anything else?
User: I need to track the workout, so use my Fitbit, no, use my smart watch instead.
Parse: Start_exercise ( device « smart watch » )