Making a Service Status as Failed in Monitor

The issue is when i use a TRY /CATCH block and handle error within the CATCH block (which is what is required), The Monitor shows that service as Completed (because error was handled). I have enabled Auditing of that service. However If I want to falg it as Failed in Monitor, How do I do it ?

add an exit from flow, signal failure, as the last step of your catch sequence.