Flag for Overlap Meeting Time

I have created a sheet for meeting room reservation purpose with flag function if duplicate section found.

Details shown in picture "Question 1".

Question 1

May I know if there is any formula only flag the duplicate row with higher Row ID number?

Question 2

Current flag function only applicable to duplicate section(criteria is date_start time), i would like to flag it if meeting B overlap meeting A with same date but different start time. Please advise if there is any formula can solve this question.



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