You wrote code using your phone?  You're a braver man than I. 😉  I filled in your missing ) and fixed the joined name.

WITH yourData(rn, Emp_ID, Hour_Type, Start_Date, Hours, End_Date) AS (
SELECT 1, 100, 'REG', '06/01/2016 8:00 AM', 4, '06/01/2016 12:00 PM' UNION ALL
SELECT 2, 100, 'SL', '06/01/2016 12:00 PM', 4, '06/01/2016 04:00 PM' UNION ALL
SELECT 3, 100, 'OT', '06/01/2016 04:00 PM', 2, '06/01/2016 6:00 PM'
)
SELECT a.Emp_ID,
  a.Hour_Type,
  a.Start_Date,
  a.Hours,
  End_Date = b.Start_Date
FROM yourData a
  JOIN yourData b ON a.rn = b.rn - 1;