Is information sent to openat accessible to other users?

I thought the answer to this question would be already available but I’m afraid can’t find anything.

If I was to send data from a customer database to OpenAI for processing - creating a well formatted answer for example, if that data going to be available to other users?

If for example I queried a database to find out how much person X spent in a given year, and sent that the OpenAI for expressing in a friendly manner, would someone else be able to access that information?

I guess perhaps if I put placeholders instead of sensitive information and did a find and replace afterwards, that might be a way to avoid the problem?