Possible scammer? (your thoughts and expertise please)


Note: I searched the terms "fraud and scammer" first before posting this question.

I recently opened a new store, and I had an order by the same person 3 times, each time abandoned.
Does this mean it was a possible scammer trying multiple credit cards or something?

Should I just let this one go?

Or follow up by email and ask if they need assistance?

Your experience and thoughts please.