user: Question: What is Date, when Event is Billabong Pro?
Columns: ['Date', 'Location', 'Country', 'Event', 'Winner', 'Runner-up']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['February 27-March 11', 'Gold Coast', 'Australia', 'Roxy Pro Gold Coast', 'Chelsea Hedges ( AUS )', 'Carissa Moore * ( HAW )']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Event" = 'Billabong Pro';