user_query: add butter to list called shopping 
response_text: Alright, I added butter.
user_query: remove flour off list called shopping 
response_text: Alright, I deleted flour.
user_query: Add flour to list called shopping 
response_text: Sure, I added flour.
User: Could you give me messages for diese Woche?
Parse: Get_message_content ( message Electronic_message ( date « diese Woche » medium « messages » ) )