Sounds a bit like Tom’s Diner by Suzanne Vega
It has lyrics aside from la la la, though.

(This isn’t all of them.)
I am sitting
In the morning
At the diner
On the corner

I am waiting
At the counter
For the man
To pour the coffee

And he fills it
Only halfway
And before
I even argue

He is looking
Out the window
At somebody
Coming in

“It is always
Nice to see you”
Says the man
Behind the counter

To the woman
Who has come in
She is shaking
Her umbrella