Arrival: Nobody involved in security will know or care when you plan to return. You won't even see them, since this is a domestic flight (no customs or immigration), except perhaps for the agent who makes sure nobody enters the secure area through the exit.

Departure: Nobody involved in security will know or care when you arrived. All they'll see is your departure boarding pass and your ID.

Airline check-in agents will be able to see that you're on a round trip ticket with a short stay, but they won't care.

Bottom line: don't worry.