user: Question: When did the team play against Niagara?
Columns: ['Date', 'Location', 'Opponent', 'Cyclones Points', 'Opp. Points', 'Record']
Types: ['text', 'text', 'text', 'real', 'real', 'text']
Sample row: ['Nov. 16/08', 'Ames', 'UMKC', 77.0, 45.0, '1-0']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Niagara';