update openai message

app.py

@@ -101,6 +101,11 @@ def chatgpt_openai(height="", gender="", bmi_class_model1="", age=""):
     os.environ["OPENAI_API_KEY"] = os.getenv("OPENAI_API_KEY")
     content = f"""I have a person {gender} who is {height} and classified as {bmi_class_model1}. 
                 Can you suggest a reasonable range of BMI values that typically represent people who are {bmi_class_model1}.
+
+                Do not include any explanations, only provide a  RFC8259 compliant JSON response  following this format without deviation.
+
+                Do not output something that begins with "```json". please give json in define format.
+                
                 Output JSON in this format:
                 {{
                 "bmi_range": {{