What do I say in a letter asking for the status of my interview?
You mean the "status of your JOB APPLICATION" don't you?
The status of your interview is obvious: "Over".
I think it is good you came here and asked for help with that writing/letter.
Here is a quick start, you change as you wish.
I appreciated my interview with you on (date) and it was a pleasure meeting you and dicussing the job.
I remain very interested in the position and would be pleased to give you any additional information you might wish or to come back for a follow-up interview if that might be helpful.
Please let me know if there is anything else I can do at this time to advance my application seeking to fill the position.l
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them