Update PlanDataService.tsx

Author: Fr4nc3

src/frontend/src/services/PlanDataService.tsx

@@ -20,7 +20,8 @@ import {
   MStepBE,
   AgentMessageResponse,
   FinalMessage,
-  StreamingMessage
+  StreamingMessage,
+  UserRequestObject
 } from "@/models";
 import { apiService } from "@/api";