user_query: add to the sports list
response_text: What do you want to add?
user_query: cheese
response_text: Got it, I added cheese.
User: Using Live Nation please buy 4 tickets to Zac Brown Band playing in September
Parse: BuyEventTickets ( event_performer « Zac Brown Band » event_time « September » provider « Live Nation » ticket_quantity « 4 » )