Wiktionary
nonconversation
n. That which is not a conversation; especially a discussion that cannot be regarded as a conversation (because, for example, only one person is speaking).
Usage examples of "nonconversation".
He hadn’t yet made time to go to sickbay—partly because he knew many members of his crew needed medical attention far more than he did, and also because he wasn’t interested in another awkward nonconversation with Dr.
My own contribution to nonconversation was, “I haven’t been so loaded down with junk since we landed on Malgar Island.