Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the transfer window with n/a as the Transfer fee, free agent for the Moving to, and Joe Sagar as the name?

### Inputs:
table_name: table, columns: ['Nat.', 'Name', 'Moving to', 'Type', 'Transfer window', 'Transfer fee']

### Response:
SELECT Transfer window FROM table WHERE Transfer fee = n/a AND Moving to = free agent AND Name = joe sagar