user: Question: What is the transfer window for Christian Nerlinger?
Columns: ['Nat.', 'Name', 'Moving to', 'Type', 'Transfer window', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['GER', 'Christian Nerlinger', 'Free Agent', 'Transfer', 'n/a', 'n/a']
SQL:

assistant: SELECT "Transfer window" FROM "Table" WHERE "Name" = 'Christian Nerlinger';