user: Question: What is the transfer window of the player moving to Panionios?
Columns: ['Nat.', 'Name', 'Moving to', 'Type', 'Transfer window']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['ITA', 'Ceccarelli', 'Milan', 'Co-ownership Termination', 'Summer']
SQL:

assistant: SELECT "Transfer window" FROM "Table" WHERE "Moving to" = 'Panionios';