user_query: add barbie doll to christmas list
response_text: Got it, I added barbie doll.
user_query: actually cancel that
response_text: Are you sure you want to go ahead and delete it?
user_query: yes
response_text: OK, I deleted the list called "christmas."
User: Call Juan's iPhone with volume.
Parse: Initiate_call ( callee Personal_contact ( label « iPhone » person « Juan » ) options Call_parameter_setting ( parameter « volume » ) )