change the user id to optional and with deafault value

app/routes/chat.py

@@ -1,3 +1,5 @@
+from typing import Optional
+
 from fastapi import APIRouter
 from fastapi.responses import StreamingResponse
 from pydantic import BaseModel
@@ -8,8 +10,10 @@ from app.utils.streaming import stream_response
 router = APIRouter()
 
 class ChatRequest(BaseModel):
-    user_id: str
-    message: str
+
+    user_query: str
+
+    user_id: Optional[str] = "alekhya"
 
 @router.post("/chat")
 
@@ -17,14 +21,14 @@ async def chat(request: ChatRequest):
 
     response = await generate_response(
         request.user_id,
-        request.message
+        request.user_query
     )
 
     return StreamingResponse(
         stream_response(
             response,
             request.user_id,
-            request.message
+            request.user_query
         ),
         media_type="text/plain"
     )