user: Question: When is Northern Ireland the opponent?
Columns: ['Date', 'City', 'Opponent', 'Results¹', 'Type of game']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['February 27', 'İzmir , Turkey', 'Turkey', '1:1', 'Friendly']
SQL:

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