Update utils/mongo_utils.py

utils/mongo_utils.py

@@ -64,9 +64,9 @@ def get_prompt(query):
     - model (string datatype)
     
     price should only be a numerical number. dont write words or text or abbreviations. Just numbers like 40000 or 50000. 
-    return "NULL" in the field if it is not mentioned
+    return "NULL" with proper quotation marks in the field if it is not mentioned
     You goal is to extract the price and features of a car from a given user query.
-    return a json only
+    return a json only and ensure the output is a valid JSON response
 
     example output:
     {{