user: Question: Which date has an Away team of Richmond?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['St Kilda', '9.5 (59)', 'Richmond', '3.15 (33)', 'Junction Oval', '20 June 1908']
SQL:

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