How to get minimum date using an array

Dear Friends,

PFA

In column N, O, I need to get the start date and end date. I have given the formula (with array) using google search.
But I am unable to get the correct result in cells marked in yellow.

The total rows would be around 2000 and would be increasing every month.

Can you help me with the formula which could get me the result automatically once col. A is updated.

Please assist.