I took issue with calling out the airport, multiple times in full phonetics, both at the beginning and the end of the transmission. All other callsigns, perfectly reasonable.
So, "Columbia traffic, Cessna november one two three alfa bravo [N123AB], three mile final, full stop, runway one eight, Columbia traffic"
At a towered airport, you'd say "Columbia tower" instead, and you don't have to repeat it at the end of your message.
Frankly, it should know (like I have to) if it's going to auto land at a towered field or uncontrolled, and adjust as necessary to those circumstances.