Deipnosophist: (noun) A person with excellent dinner table conversation skills.
In a sentence:
Restaurant manager: That table has been roaring with laughter all evening, what’s going on?
Waiter: The man at the head of the table is quite a deipnosophist.
Restaurant manager: Well tell him to shut up, he’s ruining the other guests’ evening.
Waiter: What other guests?
Restaurant manager: I think I’m going to lose my job.
Waiter: It’s probably for the best sir.