user: Question: Which date had a site of N/A?
Columns: ['Date', 'Site', 'Sport', 'Winning team', 'Series']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 3, 2011', 'Ames', 'Volleyball', 'Iowa State', 'Iowa State 2–0']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Site" = 'N/A';