Question

Conversation between two person one word substitution

Answer 1

A conversation between two people is a dialogue (BrE) or dialog (AmE). The word derives from the Greek for "two speakers". Differentiating it from a monologue, which is a speech by one person. 'Conversation' could be the word you are looking for.

Answer 2

a conversation between two people is a dialogue dialogue the word derived from the Greek for two speakers differentiated from a monologue which is a speech by one person. Conversation could be the word you are looking for.