user: Question: What was the date of the game when the away team was South Melbourne?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '14.12 (96)', 'South Melbourne', '14.9 (93)', 'Arden Street Oval', 14000.0, '20 May 1950']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team" = 'South Melbourne';