user: Question: Which Series are on September 15, 2007?
Columns: ['Date', 'Site', 'Sport', 'Winning team', 'Series']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 4, 2007', 'Cedar Rapids', 'M Golf', 'Iowa State', 'Iowa State 2–0']
SQL:

assistant: SELECT "Series" FROM "Table" WHERE "Date" = 'September 15, 2007';