Is there a way to do conditionally formatting based on a rolling date?

Is there a way to find duplicate entries over a rolling number of days? For example, I have a date in one field and a name in another field. If that name were to re-appear within X number of days, then I would like to flag those entries.

For example, let's say I enter "John Smith" on 1/9 and let's also say that my range is 5 days. If his name appears again on 1/12, I would want both entries to be flagged.

I would be working off of two fields. A date field and a name field. The trick is that I need it to be a rolling date range.

I've been using Excel for close to a decade but in all of that time, I've just done the basics with it.

Any help that can be offered will be greatly appreciated. Thanks in advance.

that can easily be done with conditional formatting, can you upload an example of what you have at the moment with dummy information ?

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