CREATE TABLE #SOURCE (
	level int not null,
	time_from datetime not null,
	time_to datetime not null,
	fee_amount int not null
);

INSERT INTO #SOURCE VALUES
	(1, '09:00:00', '11:00:00', 5),
	(1, '13:00:00', '14:00:00', 5),
	(2, '08:00:00', '16:00:00', 6),
	(4, '08:00:00', '16:00:00', 3);

SELECT *
FROM #SOURCE;

WITH TIMEFROM AS (
	SELECT time_from FROM #SOURCE
	UNION
	SELECT time_to FROM #SOURCE
),
TIMETO AS (
	SELECT time_to FROM #SOURCE
	UNION
	SELECT time_from FROM #SOURCE
)
SELECT
	level,
	time_from,
	time_to,
	fee_amount
FROM (
	SELECT
		ROW_NUMBER() OVER(
			PARTITION BY TIMEFROM.time_from
			ORDER BY #SOURCE.level) ROWNUM,
		#SOURCE.level,
		#SOURCE.fee_amount,
		TIMEFROM.time_from,
		MIN(TIMETO.time_to) OVER(
			PARTITION BY TIMEFROM.time_from) time_to
	FROM TIMEFROM
	INNER JOIN TIMETO
		ON TIMEFROM.time_from < TIMETO.time_to
	INNER JOIN #SOURCE
		ON #SOURCE.time_from <= TIMEFROM.time_from
		AND TIMETO.time_to <= #SOURCE.time_to
	) TBL
WHERE ROWNUM = 1
ORDER BY level, time_from

DROP TABLE #SOURCE