There is a clear distinction between assassins and mercenaries where Henry is from, which is perhaps for the best given how hostile he is towards assassins. Her answer suggests that she comes from a different world.

"Dependable? Hm."

But he lets the subject slide.

"If that is all?"

She seems to be doing fine without assistance, so their time, he thinks, may be better spent elsewhere. Henry is not one for much small talk.