user: Question: What callsign has 1300 as the frequency?
Columns: ['Frequency', 'Power D/N', 'Callsign', 'Brand', 'City of License']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [790.0, '1kW/500W', 'XEFE', 'La Pura Ley', 'Nuevo Laredo']
SQL:

assistant: SELECT "Callsign" FROM "Table" WHERE "Frequency" = 1300.0;