user: Question: What is Tie No, when Away Team is "Millwall"?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Luton Town', '1–0', 'Millwall', '13 March 1985']
SQL:

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