user_query: Add Rice, egg and cooking oil to my Grocery list.
response_text: Sure, I added Rice, egg and cooking oil.
user_query: Remove Cooking oil and egg from the list.
response_text: I couldn't find those two things.
User: On my vacation list, I mean summer list please add sunglasses.
Parse: Add_item_to_list ( items « sunglasses » list_label « summer » list_singular_or_plural « list » )