"substantive dialogue" is correct and usable in written English.
You can use it to refer to an exchange of meaningful ideas or opinions in a conversation, discussion, or debate. For example, "The meeting was productive because the participants engaged in substantive dialogue about the project."
But so far there is no substantive dialogue between the sides.
But so far in Bahrain, there is no substantive dialogue between the sides.
In the Clinton-Bush years, email was a tool for substantive dialogue.
Hopefully this can be accomplished with a minimum of melodrama and a maximum of substantive dialogue.
But Republicans were more concerned about sound bites of "Armageddon" and "socialized medicine" that made headlines rather than substantive dialogue.
When foreign visitors meet with her, they report that she listens but offers little in substantive dialogue.
"I urge the two sides to engage, as soon as possible, in a substantive political dialogue" she added.
"The secretary general believes that the latest situation underlines the necessity for national reconciliation and urges the two sides to engage, as soon as possible, in a substantive political dialogue," said Mr. Annan's spokesman, Fred Eckhard.
He urged her to engage in "substantive and candid dialogue".
So while Mr Obama will use his visit to Hiroshima to revisit his anti-nuclear ideals, the substantive US-Japanese dialogue will be concerned with nuclear deterrence in the face of China's military build-up.
But this will be possible only if we in research universities contribute our talents to maintaining the security of our homeland, and if the Federal government and academia maintain a respectful, substantive, and effective dialogue between those who do science and those who are charged with protecting the nation.
