Usual caveats apply when writing an email, including:
Be precise in what you are looking for. If you ask along the line of »I wanted to know if it is currently possible to write a bachelor thesis«, the answer is probably yes, but why are writing me? At least tell me what you are interested in! Embedded system? Verification? SAT? Theoretical work? Implementation?
Be precise about your background: »I am looking for a bachelor thesis« is nice, but what is your background? ESE? CS? I will judge you based on your email, so make it complete
Be precise about the related courses: »I took an Isabelle lecture and a SAT lecture« or »I did have an Isabelle lecture, but I already had a Lean lecture« is something you should mention.
Don’t be overly precise though: »I am interested in verification since I am 6« is not something I want to see in an email (I have read enough variants of it in motivation letters).
I know that this is more work, but it largely increases the likelihood of getting an answer.