Train travel within France, to buy a Rail Pass or Not?

I am wondering if it is best to purchase a rail pass and/ or reserve train tickets for my upcoming visit to France, we will be there the last week of April into the first week of May. My husband and I will be basing ourselves out of Paris and will be traveling to Bayeux (1 day no overnight ), Epernay (1 day no overnight), and Beaune (2 nights). Any help with this would be appreciated!
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