When I think about the kind of varied conversations we could have with our operator, depending on the tone of previous responses even, I cannot help but think of titles like Mass Effect or Dragon Age.
I imagine it would take considerably more resources and voice-over work to record everything several times, with slight variations in the phrasing, besides the tone, to have something similar to a developing, strictly professional, relationship with our operator and maybe even certain NPCs we'll be able to interact with. I honestly would not expect the developers to undertake such a potentially arduous task. It would be costly and time-consuming.
I'm not even sure the player character should have lines beyond the basic emotes. Although, I was surprised that in that Operation, where we're stripped of our frame and have to escape a prison, the character taunts the guards with full lines. I don't know if they have different versions of that with all the voice presets, but it was nice to hear.
With that said...
I'd literally pay to hear Aero get all moody and hissy, either with my character or another NPC, who would get under her skin. Whatever her character would be called in Ember, it would be hilarious to hear her cute voice get all angry or even the opposite. Be all giddy and hyper-active. Her voice-actress would have a blast.