How would you politely decline?

I got a DM on instagram asking what my price would be for a "whole day wedding 4 hours away both photos and video"

They didn't state a date nor ask if I was available, nor have I ever stated that I can do video.

I do have a website and it is linked in my IG bio, but I don't actively market myself. Despite my lack of marketing I'm still however not available at the drop of a hat.

I'm giving the person the benefit of the doubt here, that they probably just don't understand that these things typically get booked well in advance.

Most people fill in the contact form on my website and usually send me an entire essay about their visions for their special day. I've never been "cold DM'd" on instagram like this before aside from scammy companies.

I'm at a loss for how to humbly and professionally decline without sounding like I'm potentially open to take this client. At the same time, I think that might be helpful if someone were to inform them that it's protocol to ask if the photographer has their date open first.

What would you respond? Would this be adequate:

"Thank you for getting in touch and for thinking of me for your wedding.

I only shoot stills and unfortunately do not offer video. I also take very limited wedding bookings, so I will unfortunately have to politely decline.

A little tip when contacting photographers is to also send the date and locations directly in the first message, as many wedding photographers are booked well in advance and need to check availability first.

Wishing you all happiness, and good luck with planning your special day!"