This quest is for a synth companion. The player enters a vault, and discovers she and other android prototypes were being trained in the vault to be assassins.

The Overseer hires Gunners to bring her in, but the player and her kill them and follow the trail back to the vault, where they encounter the Overseer.

Player enters Overseer’s room

Well, it’s obvious I should’ve been paying you instead of the gunners. But at least it all worked out in the end.

Who are you? What is this place?

Running deactivation code RA dash zero 8b. 

Mara shuts down

There we are.

(turns to player)

Oh, don’t look at me like that. Your companion will be fine. But for safety reasons, I think it’s best we discuss her in private.
But first, tell me, who are you? What’s your relationship to this model?

Why don’t you tell me who you are first?
I’m the Overseer of this vault. My job was to evaluate these combat sentries and make recommendations for the field.
When the government was dissolved, I felt I had an obligation to deactivate all personnel.
I don’t know if you have any personal attachment to this model, but I’m afraid you won’t be seeing her again. She’s far too dangerous.

(Get angry) Who the fuck am I? Who the fuck are you?
Easy to anger and emotionally unstable. It’s a miracle the two of you haven’t killed each other. 
Fine. It doesn’t matter who you are. I’m the Overseer of this vault, and this android is my responsibility.

(repeat, no need to record unless transition is off)

I don’t know if you have any personal attachment to this model, but I’m afraid you won’t be seeing her again. She’s far too dangerous.

(I’m her friend) I’m a friend.
Well, that’s unusual. The Mara prototype doesn’t make friends. More often than not, she kills those she comes into contact with.
That’s why, for your protection and mine, we need to deactivate her permanently. 
I’m sorry, but I’m afraid that means you won’t be seeing her again.

(Not your business) That’s none of your business.
True. Although had I known she’d be traveling with a soldier, I would’ve sent more gunners.
Fortunately, those mercenaries are the last lives she’ll ever take.
(repeat bit about never seeing her again)

I’m going to see her. One way or the other. Your choice.
That would be unwise. It’s not as simple as hacking the terminal and walking out the door.
The units in this vault share the same codes. Activate one, and you set them all free.
That’s four Assaultrons in total, all instructed to shoot intruders on sight. You’ll never make it out of here alive.

Dangerous? How?
It’s the programming, really. Androids like her can’t tell the difference between friendlies and hostiles. They’re not designed to.
Her actions are driven by need. In that regard, she’s no different than a serial killer.
This unit’s only objective is to kill, and she does so without prejudice. 
You attempt to re-activate her, and you’ll see precisely what I mean.

(threaten) The last guy who gave me this sales pitch, ended up dead.
It’s not a sales pitch. It’s the truth. A truth I have seen over and over again for 200 years.
Machines like this don’t change or adapt. They do as they’re programmed. 

Why should I trust you?
Because I’ve studied this model for over 200 years. If anyone knows what she’s capable of, it’s me.
But I’m not the one with the gun.
In my experience, people who carry them tend to do what they want, reason be damned.

objective: Activate or permanently deactivate units

You’re a fool. She’s a killing machine. It’s only a matter of time before she turns on you.

If you leave this facility, then I’ll take it to mean you agree with me.

if units are de-activated

I’m glad to see that you’re not completely without reason. I’ll take it from here.

Thank you for your assistance in bringing this unit back safely.

You showed wisdom in leaving her with me.