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I went back and read your 2018 message. I searched the subscription site Roots Ireland and made a number of searches but did not find a baptismal or civil birth record for your John Hally. Although there were a number of John Hally baptismal records in Co. Waterford with father John, none had a mother of Hanora or Nora. I focused on the Aglish parish records and did not see any good leads. I tried Healy. I also tried Dower instead of Dahol (there were a number of Dowers in Aglish parish) but never found a good record.
I searched on the free site www.irishgenealogy.ie for civil birth records in the Dungarvan district from 1864-1866. There were three John Hally records but none with a father John. I also searched for any Hally birth records from 1864-1866 and did not see a good lead.
Not sure where to go next. Maybe John was not from Waterford. Let me know if you have any other information.