added introductory prompt

backend.py

@@ -16,8 +16,6 @@ from llama_index.core.llms import ChatMessage, MessageRole
 
 
 
-
-
 huggingface_token = os.getenv("HUGGINGFACE_TOKEN")
 login(huggingface_token)
 
@@ -102,7 +100,7 @@ def handle_query(query_str: str,
             
             index = build_index("data/chiarimento.txt")
             gr.Info("index costruito con richiesta di chiarimento")
-            chat_engine.reset()
+            
                   
     else:
       
@@ -132,9 +130,11 @@ def handle_query(query_str: str,
         verbose=False,
         )
         
+        #chat_engine.reset()
         
         outputs = []
         response = chat_engine.stream_chat(query_str, conversation)
+        
         #response = chat_engine.chat(query_str)
         for token in response.response_gen:
           #if not token.startswith("system:") and not token.startswith("user:"):