user_query: Add cellphone, power bank and headset to my Shopping list. 
response_text: Got it, I added cellphone, power bank and headset.
user_query: Remove headset from the list.
response_text: I couldn't find headset.
user_query: Remove headset from my Shopping list.
response_text: I couldn't find headset on your list called "Shopping."
user_query: Remove power bank from my Shopping list.
response_text: I couldn't find power bank on your list called "Shopping."
User: Send an email to uh Wendy and um let's um copy Elizabeth.
Parse: Send_digital_object ( cc Personal_contact ( person « Elizabeth » ) medium « email » recipient Personal_contact ( person « Wendy » ) )