Cong. Inquiry example?

Hi all,
The posts on here have been such a huge help. I’ve noticed several users have mentioned in other posts that they’ve sent congressional inquiries to their senator or representative. Does anyone have an example, advice, or possibly even a redacted version they wouldn’t mind sharing? I need to send one this week and thought it’d be best to ask those of you that have already successfully sent one as a starting point. Any / all help is extremely appreciated