user: Question: Willy Sagnol with a type as Career end had what has the transfer fee?
Columns: ['Nat.', 'Name', 'Type', 'Transfer window', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['GER', 'Oliver Kahn', 'Career end', 'Summer', 'n/a']
SQL:

assistant: SELECT "Transfer fee" FROM "Table" WHERE "Type" = 'Career end' AND "Name" = 'Willy Sagnol';