user: Question: What date had an opponent of Sweden and a Friendly type game?
Columns: ['Date', 'City', 'Opponent', 'Results¹', 'Type of game']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['May 28', 'Belgrade', 'Denmark', '5:1', 'Friendly']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Type of game" = 'Friendly' AND "Opponent" = 'Sweden';