Sep 24, 2014 - 08:20 AM
The ticket from Fuimicino to Rome Termini is good for that route any time until the 5th of October.
The ticket from Rome Termini to Naples is not changeable not cancellable and not refundable per the fare rules. You will need to purchase a new ticket for that trip. You should be able to request a refund from your trip insurance company.