"Lack of evidence is not evidence of lack."

That said, there is no evidence of any intelligent civilization prior to humanity. If dinosaurs, or for that matter, some other species, had achieved our current human level of civilization, only to be wiped out by an asteroid collision with the Earth, there would be evidence that that high level civilization had happened. We wouldn't see the huge deposits of coal and oil dating back to the Carboniferous and the huge deposits of iron dating back to the two billion year old oxygenating of the atmosphere, all of which we are currently exploiting. We would see strange bands of iron embedded in very thin and narrow but very long rock formations (i.e., 65 million year old freeways). We don't see any of that. A dinosaur equivalent of our current level civilization can be ruled out.

On the other hand, if dinosaurs or some other species had only achieved the equivalent of pre-pottery Neolithic civilization when the first towns were being built by humans (about 10000 years ago), only to be wiped out by an asteroid collision with the Earth, there might well be no evidence of that. It has been hard enough for archeologists to find the rather faint signs of those 10000 year old civilizations, and that's mostly because those archeologists know where to look. Finding signs of an equivalent 65 million year old civilization where no one knows where to look would be nigh impossible. Lack of evidence is not evidence of lack.