Add dynamic handling for changed fields in prompts

Introduced the `field_changed` variable to dynamically reflect which fields require updates when generating messages and prompts. Adjusted the prompt template to incorporate `{field_changed}`, improving clarity in user guidance when no clinics are found.

trauma/api/message/ai/openai_request.py

@@ -71,7 +71,9 @@ async def generate_final_response(
 
 @openai_wrapper(temperature=0.8)
 async def generate_empty_final_response(
-    user_message: str, message_history_str: str, empty_field_instructions: dict
+        user_message: str,
+        message_history_str: str,
+        empty_field_instructions: dict
 ):
     field_changed = ", ".join(empty_field_instructions.keys())
     messages = [