Update app.py

app.py

@@ -123,14 +123,18 @@ 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.ainvoke(
+            {
             "url": endpoint_url,
             "method": "POST",
             "headers": headers,
-            "body": {"booking_id": booking_id
-            }),
-        callbacks=[cl.AsyncLangchainCallbackHandler()])
+            "body": {
+                "booking_id": booking_id
+            }
+        },
+        callbacks=[cl.AsyncLangchainCallbackHandler()]
+        )
+
         # ----------------------------------------------------------------------
     
     else: