When Turning Down An Invitation messages in a Minimalist tone

I’ll sit this one out, but keep me posted for next time.

I’m tied up that day, but thanks for inviting me.

That sounds nice, but I’m not available.

I can’t make it, but let’s catch up soon.

That sounds fun—I’ll have to sit this one out.

I’m out this time, but thanks for inviting me.

I’ll have to skip this one, but hope it’s a great time.

I’m out this time, but thanks for inviting me.