Dear Conference Panel Leader,
Thank you SO much for accepting my paper within 24 hours of me sending you the proposal. Such great turn around! And thank you for saying you are enthusiastic about my paper.
What you don't know is that it's been about 11 years since I've presented a conference paper, and there's still a lot I don't know about my area of study.
So, now I will start researching the topic in earnest so that I can write a decent paper and avoid being the ignorant asshat who drives your panel into the ground.