user: Question: What is the Transfer window, when the Transfer fee is "Free", and when the Name is Dugdale?
Columns: ['Name', 'Country', 'Status', 'Moving to', 'Transfer window', 'Transfer fee']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Otsemobor', 'ENG', 'Transfer', 'Norwich City', 'Summer', 'Free']
SQL:

assistant: SELECT "Transfer window" FROM "Table" WHERE "Transfer fee" = 'Free' AND "Name" = 'Dugdale';