user_query: music list
response_text: What do you want to add?
user_query: music
response_text: Alright. Which list do you want to add to?
user_query: Add something to the list with metallica
response_text: OK. Which list do you want to add to?
User: Send an email to to the vet about the puppies.
Parse: Send_digital_object ( medium « email » object Electronic_message ( subject « the puppies » ) recipient Personal_contact ( person « the vet » ) )