user: Question: When did an away team score 15.7 (97)?
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', '25.13 (163)', 'South Melbourne', '14.21 (105)', 'Glenferrie Oval', 13369.0, '21 June 1969']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team score" = '15.7 (97)';