conversation,
one-to-one, heart-to-heart, tête-à-tête, talk, dialogue, exchange, discussion,
chinwag (UK, informal), natter (UK, informal)
talk,
converse, gossip, chew the fat (slang), dialogue, yak (informal), chitchat
(informal), shoot the breeze (US, slang), jaw (slang), chinwag, natter
(informal)