user: Question: When did South Melbourne play as the away team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '6.15 (51)', 'Melbourne', '4.9 (33)', 'Glenferrie Oval', 20000.0, '11 May 1957']
SQL:

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