“No” is not a complete answer; a complete answer is, “yes, if only we had <fill in the blank>”. You’d be amazed how often simply stating what would make things easier can do… for relationships, for earning trust, for identifying root issues, and most importantly for driving innovation.
Also make a point that good ideas can originate from anywhere. Then take those ideas seriously when they’re presented. And recognize that ideas you hear (as a Product Manager) are typically shorthand for problems and solutions. Usually, with a little abstraction, you’ll discover some real nuggets.