"My name is John, and I'm the Creative Director at Company. I found you through person / site, and love the work you did for this other company.

I'd love to hire you to help us with our pitch deck, presentation template, or something else presentation related. Our timeline looks like dates and we'd like to keep the budget around $6-7k.

I have attached our current presentation, outline, or draft so you can get a better idea of the content.

Full disclosure: I'm talking with a few other agencies like these folks. Let's set up a call and discuss the details. I am available on these days and times. Thank you!"