[Akiha knows Lambda well enough to know she didn't specifically seek Urd out. More that she happened to pass by where Urd was and decided to attempt socializing more. Since, Akiha kind of told her to...]

The scientists that made her altered her memories and erased everything from before about six months or so ago for her. [This fact clearly angers Akiha.] She doesn't remember being fully human, so it's been a task. But she is learning and making progress.

Though I'm not entirely sure you're the best example of how to have a normal conversation.