On an early flight MSO-SLC many years ago, when the FA asked me what i wanted for my PDB I said coffee, because i was still trying to wake up. She asked if i wanted anything in the coffee, and I figured my MSO-SLC-ATL-DTW itinerary (plus two CRC visits) would be more than ample opportunity for indulging, so said i'd wait for that until we were in the air. Point being, many DL FAs in F need no prompting for serving adult beverages at any hour.