user_query: Add milk and eggs to my list name serenity
response_text: I couldn't find a list called "Serenity." Do you want me to make one?
user_query: yes
response_text: Alright, I made a list called "Serenity" and added those two things.
User: Go to Kroger and get some milk, no I mean soda.
Parse: Get_product ( product « soda » product_source « Kroger » )