user: Question: Which date has a competition type of Friendly and a score of 2-1?
Columns: ['Date', 'Venue', 'Score', 'Result', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['5 April 1879', 'Kennington Oval , London', '3-1', '4-5', 'Friendly']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Competition" = 'Friendly' AND "Score" = '2-1';