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Search CSV for value. Report if not found.

I've racked my brain and can't figure this one out.

I've got a script that parses through an existing CSV (two columns) and pulls info from it.
However, I want to process a function if the value entered by the end user is not found (error handling essentially).

What's a simple example of how to do this?

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Krzysztof Pytko

8/22/2022 - Mon
Krzysztof Pytko

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