"instructive conversation" is a correct and usable phrase in written English.
It can be used to describe a conversation that is educational or informative in nature. Example: The professor led an instructive conversation with her students, discussing the history and cultural significance of the artwork they were studying.
I had an instructive conversation in the town hall as I looked at a mosaic, depicting a Leopard and dedicating the museum to its author.
Indeed, there was some substance in Wednesday's debate, like the reasonably instructive conversation about earmarks the only portion worth watching that was too deep-in-the-weeds for most viewers (and represents a vanishingly small portion of the budget anyway), while the more pressing issue of unemployment and the wreckage of the housing market was something of an afterthought.
EAST RUTHERFORD, N.J. — The hallway near the meeting rooms at the Giants' training center is a relatively quiet place, an area typically reserved for intense film study and instructive conversations among players and coaches.
This approach did lead to some very instructive conversations, some I have noted here.
The point is this: we should be having instructive conversations with those we love regularly, not just in the shadow of tragedy.
It was a very instructive, very positive conversation, and I'm delighted to have been able to be of some assistance to him".
Hopefully, you'll find the conversation instructive, too.
The cases he brought up were extreme, but instructive, and though the conversation wandered among arcana, there were two practical points that Lieber wanted everyone to remember.
The time and energy spent on crosswords, the Times explains, would be more profitable "devoted to reading an instructive book, or intellectual conversation" - or, again, working.
In the meantime, here are some other interesting — and instructive — outtakes from that conversation.
In the meantime, here are some other interesting — and instructive — outtakes from that conversation.
