user_query: Add Sting to my list.
response_text: Alright. Which list do you want to add to?
user_query: Music
response_text: Got it. Which list do you want to add to?
user_query: Music list
response_text: What do you want to add?
User: Order 4 tickets from uh, Ticketmaster.
Parse: BuyEventTickets ( provider « Ticketmaster » ticket_quantity « 4 » )