user: Question: When was the game where the away team had a score of 13.8 (86)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Footscray', '13.12 (90)', 'North Melbourne', '12.22 (94)', 'Western Oval', 17300.0, '24 June 1950']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team score" = '13.8 (86)';