user: Question: What is the transfer window for Hleb?
Columns: ['Nat.', 'Name', 'Moving from', 'Type', 'Transfer window', 'Ends', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['MLI', 'Keita', 'Sevilla', 'Transfer', 'Summer', 2012.0, '€14M']
SQL:

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