user_query: add chocolate to Valentine's Day list
response_text: I couldn't find a list called "Valentine's Day." Do you want me to make one?
user_query: yes
response_text: Sure, I made a list called "Valentine's Day" and added chocolate.
user_query: you know what take chocolate off that list and put it on anniversary list instead
response_text: I couldn't find a list called "Anniversary."
user_query: i want to add the item to my anniversary list
response_text: What do you want to add?
User: Can you make a conference call with Sam and Philip?
Parse: Initiate_call ( callee Personal_contact ( person « Sam » person « Philip » ) )