Welcome to our Community!
As you can read on this article of our website
(in Italian), EU Citizens can use their national identity card to travel to the Republic of Ireland, so you won't need a passport in order to flight to Dublin.
Anyway, I suggest that you get in contact with the airline you're flying with and ask again if and why they need any additional documents.
Moreover, check out this page about Dublin
to know more about the city and its attractions.
Buon viaggio e ricorda che puoi scriverci anche in italiano se lo preferisci!