Genuine Discourse vs. Attempted Conversion

Is genuine dialogue possible if I (as one partner in the dialogue) am already convinced that I possess the fullness of truth, and so the other does not have something to tell me which I could not in principle discover from my own tradition? Wouldn't dialogue, in such circumstances, be nothing more than a thinly disguised apologetics?

As a religious minority, this point is why I prefer not to discuss my religious practices and beliefs with born-again Christians. If your only goal in discussing religion with me is to "witness to me," I see no value in even starting a conversation.

Why I Am Not Orthodox by N.N. Trakakis