when the 'ward registrar' is identified as Damielliot he reveals that he was a sick child hospitalized in that same ward before the Calamity, only to be helped by a mysterious man/woman (determined by your character's gender) whose face he can no longer remember, and that the player seems "familiar" to him, as if "that same person returned to help him again" (paraphrased.). This is a reference to the 1.0 Ul'dah main scenario quest 'Calamity Cometh' where he appeared in (ironically in an Echo scene from my understanding), where the player indeed helped him.
My 1.0 character had this dialogue in the Christmas event so I assume this is not the same for new characters (it wouldn't make sense in any event), although ironically, my 1.0 character actually never actually met him in 1.0, given his quest was (from my understanding) an Ul'dah main scenario quest (I started in Gridania in 1.0 like I did in ARR as well), and so I never encountered him.