user: Question: Who was the away team with a tie number of 4?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Darlington', '0–0', 'Chester', '22 November 1975']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Tie no" = '4';