1) Conversationalist 2) One skilled in table talk 3) Schmoozer 4) Table-talk adept 
• (n.) One of an ancient sect of philosophers, who cultivated learned conversation at meals.
Deip·nos'o·phist (dīp*nŏs'o*fĭst) noun [ Greek 
one who speaks learnedly at the dinner table; from a work by Athenaeus, Deipnosophistai, written in 228 A.D.
A deipnosophist is someone skilled in the art of conversation at the dining table.
[n] - someone skilled at across-the-table chit chat
deipnosophist, deipnosophistic, deipnosophism 1. Someone who is learned in the art of dining; also said to be, one who is an adept conversationalist at the dinner table. 2. A master of the art of dining: taken from the title of the Greek work of Atheneus, in which a number of learned men are represented as dining together and discussing subjects th...
noun someone skilled at informal chit chat
a person who is an adept conversationalist at table.