user: Question: What is the transfer window for Steven Thompson?
Columns: ['Nat.', 'Name', 'Moving from', 'Type', 'Transfer window', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['ESP', 'Mikel Arteta', 'Barcelona', 'Transfer', 'Summer', '£5.8m']
SQL:

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