I’m using ai to take an input from a user then based on the users input the ai will decide on what function to call. I’m using Microsoft semantic kernel, function calling method to do this. Foreach function I have parameters that need to be filled in. Example I have function to create a Message, the parameters are recipient email, subject and content of the email, with the subject being optional. When I don’t provide the subject the ai completes and fills in the subject for me. I have tried to prompting the ai not to do this however it just keeps proving data and text that I haven’t stated for it to. How can I fix this ?