List all the territories where Laura Callahan is in charge.
territories refers to TerritoryDescription; Laura Callahan is the full name of an employee; full name refers to FirstName, LastName
SELECT T3.TerritoryDescription FROM Employees AS T1 INNER JOIN EmployeeTerritories AS T2 ON T1.EmployeeID = T2.EmployeeID INNER JOIN Territories AS T3 ON T2.TerritoryID = T3.TerritoryID WHERE T1.FirstName = 'Laura' AND T1.LastName = 'Callahan'