user: Question: Which Tie # has an Away team of Slough Town?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Enfield', '2–2', 'York City', '14 November 1998']
SQL:

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