Update app.py

app.py

@@ -16,7 +16,7 @@ llm = Llama(
 )
 
 # Training prompt format for Atlas-Chat style conversation
-training_prompt = """<bos><start_of_turn>user
+training_prompt = """<start_of_turn>user
 {}<end_of_turn>
 <start_of_turn>model
 {}<end_of_turn>"""