user: Question: What was the Tie no when the away team was East Thurrock United?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['3', 'AFC Wimbledon', '0–2', 'Whyteleafe', '529']
SQL:

assistant: SELECT "Tie no" FROM "Table" WHERE "Away team" = 'East Thurrock United';