He was surprised to hear the voice, not noticing anyone else in the plaza when he'd stopped for a breather. Booth stood up straight again, looking over his shoulder in the direction of the speaker.
"Morning," Booth replied with the managed cheerfulness of someone who was awake but not fully rid of the brain fog yet. Technically being an ungodly hour, even if he did it to himself, he figured it was worldly accepted to be somewhat scatterminded. The brunette looked like she might possibly be wide awake, however, and if he was reading her right, a little awkward.
And, as a sociality used even among strangers, "How are you?"