Cass wasn't overly surprised by the letter, not after the conversation he'd had with Alicia just yesterday. Of course the fact that Percy also trusted Oliver didn't hurt, and so it was without hesitation he penned an owl back.
Oliver,
There is really no need to be so formal seeing our mutual friends, and ideas are always good and I'm more than willing to hear them out. Just let me know when and where and I'll try to make the time.
Sincerely, Cass
PS: Perhaps we could kill two birds in one stone and I'll check on the wards as I promised Alicia at the same time? Otherwise I'll just do that at a later date. Give her my best.