Update app.py

app.py

@@ -83,7 +83,7 @@ def get_conversation_chain(vectorstore, tokenH):
     def generate_response(messages):
         try:
             completion = client.chat.completions.create(
-                model="mistralai/Mistral-7B-Instruct-v0.3", 
+                model="Qwen/Qwen2.5-72B-Instruct", 
                 messages=messages, 
                 max_tokens=500
             )
@@ -97,7 +97,7 @@ def get_conversation_chain(vectorstore, tokenH):
         retriever = vectorstore.as_retriever(search_type="similarity", search_kwargs={"k": 5})
         documents = retriever.get_relevant_documents(user_input)
         documents_text = "\n".join(doc.page_content for doc in documents)
-        messages = [{"role": "user", "content": user_input}, {"role": "assistant", "content": documents_text}]
+        messages = [{"role": "user", "content": user_input}, {"role": "system", "content": documents_text}]
         return generate_response(messages)
 
     return conversation_chain