Moiraine is within ten yards of the younger girl before the breeze stirs the branches and flutters the edge of River's skirt, and the Aes Sedai starts as she notices her.

"Lan would scold me for days for paying so little attention to my surroundings," she mutters under her breath, but clearly. "And he would be right to."

More distinctly, then, she calls,

"Good afternoon, River."