user: Question: When was Arsenal was the away team?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Middlesbrough', '0–0', 'Orient', '11 March 1978']
SQL:

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