user: Question: What's the Date of Issue for Design of Katalin Kovats?
Columns: ['Date of Issue', 'Denomination', 'Design', 'Paper Type', 'First Day Cover Cancellation']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['7 January 2005', '50 cents', 'Hélène L’Heureux', 'Tullis Russell Coatings', 'Vancouver, BC']
SQL:

assistant: SELECT "Date of Issue" FROM "Table" WHERE "Design" = 'Katalin Kovats';