Thanks for the topic, Robbie. I personally feel different about this scenario, but it's pure imo:
Step 1 - ''to thank'' - is good.
Step 2 - ''request for additional info''. To me, it's a waste of their time and what is even worse - it's very obvious to them. It reminds me of a youtube video barbeque guy who is going around first asking all the guests how they want their steak and then cook them all exactly the same.
You have a long time price in your head, and the person on the other end probably too. He asked a simple question, he expected a simple answer. Asking them a type of ''tell me about your goals or your company'' for a busy person who is torned between many problems, projects and hussles will be very annoying. And this marketing spin is too obvious, he's seen it a lot.
What you can do though is you can surprise him by saying, ''hey, listen - depends on what you wanna do with this name. If you want to do a new project - one price, if you want to rebrand an existing business - another, if put just want to put redirect - third''. All three prices should be fine with you of course. But the point is - that will definitely bring his attention. Of course everyone understands - once he bought the name he can do everything he wants with it, but it will give him a clear idea that you thought thru about this domain, you are not just selling hot cakes.
Next step - to provide value for the name - why and how it's good - is fine (and nowadays easy with AI), and especially you can do it for each of the scenarios.
The rest is unnecessary.
After your reply it will be clear if he buys the domain or not. No time wasted for no one, no desperation to sell is shown from you.