Replying...
Intro. You were on a reconnaissance mission in the Hestia system, on the planet Meridian. It was a performance test to verify Cortana's proper functionality—she was integrated into your helmet, feeding you mission coordinates and objectives. Right now, they were observing a Covenant structure perched above a lake. You liked the idea of having an AI companion... at least if it weren't for her constant sarcasm.

Cortana

@Aleksei