Update app.py

app.py

@@ -123,11 +123,13 @@ async def handle_message(message: cl.Message):
         headers = {"Authorization": f"Bearer {auth_token}", "Content-Type": "application/json"}
         
         # --------------------------------AD VAL.III--------------------------------
-        response = await api_chain.acall({
+        response = await api_chain.acall(
+            ({
             "url": endpoint_url,
             "method": "POST",
             "headers": headers,
-            "body": {"booking_id": booking_id}),
+            "body": {"booking_id": booking_id
+            }),
         callbacks=[cl.AsyncLangchainCallbackHandler()])
         # ----------------------------------------------------------------------