user: Question: What is the date of appointment of Nejat Biyedić?
Columns: ['Name', 'Club', 'Date of departure', 'Replacement', 'Date of appointment']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Safet Sušić', 'Ankaraspor', 'May, 2008', 'Aykut Kocaman', 'May, 2008']
SQL:

assistant: SELECT "Date of appointment" FROM "Table" WHERE "Name" = 'Nejat Biyedić';