How to use data but not share with others people


I created an app that lets people fill out their health information and a virtual assistant based on openAI.

Now I would like users to be able to interact with the assistant by asking them for their blood sugar levels from the previous day, for example, but without the data being usable by other users.

How can I send this personal data and ensure that the responses are specific to each user?

Many thanks for your answer