user: Question: What is the tie no that has Southport as the away team?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Hyde United', '1–2', 'Vauxhall Motors', '97']
SQL:

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