You are sitting in a busy area...but there are various empty areas...
Set the bench on fire and see, which one of us leaves first. Or... Strike a conversation with a hearty: "Hello!" And then burn the bench.
That's like standing at then end of an empty bank of urinals and a guy walks up and stands right next to you. No words are spoken, but I keep an eye on the guy. :)
If she was young and attractive, I'd check to make sure I still had my wallet.
Say hi and brace myself to be hit up for money😊
Greet them, introduce myself and strike up a conversation.
Continue to poke in my ear with my little finger..