Adding System message in the open ai chat completion

Hi Team, I have added system message in the chat completion while fetching the answer from the private KB. I have updated this system message to handle the private KB no answer case scenario. Is I have added the system message in the below format, Add(new ChatMessage(ChatRole.System, $“You are an AI assistant that helps people find information. - Answer in 50 words or less. Use bullet lists wherever possible.- If you’re unsure of an answer, you can say I don’t know or I’m not sure and ask user to provide more context on the question.”) Asked a question out of private KB and i got the below response