user_query: put Patsy Cline on the music list
response_text: Sure, I added Patsy Cline.
user_query: rescind that
response_text: Got it. Rescind on your list called "music". Anything else?
user_query: reverse the last
response_text: Alright. Rescind on your list called "music". Anything else?
User: I would like to make a Duo, I mean Skype video call, please.
Parse: Initiate_call ( format « video » provider « Skype » )