"rich dialogue" is an acceptable phrase and can be used in written English.
You can use it to refer to dialogue that is detailed and meaningful. For example, "The novel featured rich dialogue between the characters about difficult topics".
The sparks that are struck come from the rich dialogue.
It lays the basis for a rich dialogue between biology, social science and religious history.
We look forward to a rich dialogue at NACD conferences to come.
The three joined forces for a beautifully nuanced interpretation of the harmonically rich "Dialogue of the Three Graces," from Lambert's "Airs à Une, Deux, Trois et Quatre Parties".
He has a gift for suspenseful storytelling, rich dialogue and dark laughter that allows him to handle big themes in an entertaining way.
The first two were virtually solo pieces, with only spare interjections from the other instrument, but the last was a rich dialogue.
And when people start to relate, they get into richer dialogue.
Ms. Washington-Williams said through her lawyer that she was not condoning slavery but was exploring her heritage in a way that she hoped would produce a richer dialogue about race.
If you need to escalate it to video, to have a richer dialogue, you can do that.
In B2B organizations, the salesperson is essentially the equivalent of the B2C store, but sales professionals have an opportunity to create an even richer dialogue.
Here too, we find that users on the political right are more engaged with one another on Twitter, indicating that they are likely to benefit from a richer dialogue and hence more opportunities for frame-making and consensus building with respect to political topics.
