The phrase "interlocutor of" is correct and can be used in written English when referring to the person or people with whom someone else is conversing or dialoguing.
For example: During the debate, the interlocutors of the two candidates frequently interrupted one another.
He used his mental faculties to convince his interlocutor of his own rightness, never to be convinced by the other.
Demonised by the right for having once spoken to ETA, Mr Carod-Rovira is now a regular interlocutor of the government in Madrid.
Erkki Veltheim's arrangements take the quiet, close songs of Gurrumul's albums and shake them out boldly, so that each song becomes the illuminating interlocutor of its original.
But in Mr. Kostunica, a constitutional lawyer who vows to defend Serb interests, Kosovo's Albanians have the interlocutor of their nightmares.
Qassem Suleimani, the commander of the Quds Force and bête noire of the American armed forces, last year defended the doveish foreign minister and chief interlocutor of the Americans, Mohammad Javad Zarif, against radicals in parliament.
The New York artist Sue de Beer has long established herself as an aesthetic interlocutor of teens and the occult, so Halloween provides an apt occasion for her to unveil a new work.
The United Nations plays only a marginal role now in adjudicating between Israel and Palestine, for whom the White House and select Middle Eastern powers will continue to be the interlocutors of choice.
This intention may be disguised under the mask of a parable, under the interlocutors of a philosophical dialogue, or under the admonitions of a prophet, but the reader is never oblivious of the thinker's intent.
For more than a decade, the other major Indian business group, C.I.I., has operated as one of the most influential interlocutors of Indian foreign policy, helping to facilitate closer Indian ties with Japan, Singapore and, most important, the United States.
They are the absent interlocutors of "On Vanity": the people he talks to about death, talking to himself; the only ones he describes with what could be called a deep sense of relationship.
Barely a couple of hours after Donald Trump had been declared the next president of the United States and even the political columnists, those sleek interlocutors of power, were in shock.
