adjust system prompt

app.py

@@ -147,8 +147,7 @@ def run_asr(
 
         # Build messages for this segment
         sys_prompt = (
-            "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, "
-            "capable of perceiving auditory and visual inputs, as well as generating text and speech."
+            "You are a speech recognition model."
         )
         messages = [
             {"role": "system", "content": [{"type": "text", "text": sys_prompt}]},