This happens to not be a standard dath ilani business pleasantry, prompting Keltham to start analyzing the statement for possible hidden meanings that she'd want to communicate to him; the obvious baseline interpretation, that it'd be of positive expected utility to have future interactions they'd both deemed to be of positive expected utility, wouldn't seem to communicate much extra information.
She's not... also flirting with him, is she?
If so, Keltham's kinda got enough to worry about in that department already. Maybe someday when he's got a lot more sexual self-confidence.
"I hope and expect there will be future business opportunities worth your time," Keltham replies with ambiguity-leaning-negative.