Oh, Wendy-san! It's nice to meet you. Archer-san mentioned you as well.

[He'd also warned her about Wendy's condition as well, hence Ayumu's use of an honorific more suited to someone older than her apparent age. The smile on her face is one she'd give a peer rather than a junior as well. For all of Ayumu's suspicion and difficulty adjusting to things that are unfamiliar, she's taking this particular idiosyncrasy pretty well.]

I believe he mentioned that you had something in mind that he was helping you with?