the boys are howdying

There are many scripts online you can follow, many ways to tweak your message to fit your senator (ESPECIALLY if they are up for reelection this year). Whether it's a recording you reach or a real person, be straightforward, don't argue, just let your rep know that you are a constituent and you oppose the KIDS act, etc.

maybe hold music for like a minute most depending

someone usually picks up right away in my experience

someone who works in the office will be the one answering. they will ask for your zipcode, and what youre calling about (theyve got their customer service voice on, so it eases things a little for those who are nervous)

you can say "i'm calling as a concerned constituent and would like to submit a comment"

say your business. be straightforward, and honest, as the above suggests. you can say its dangerous.

afterwards you can say "that's all for today. thank you" and the call can be over