It probably would have gone something like:

Kirmani: *scoffing* Yeah right, Dresden. 'Magic'.
Harry: *to Murphy* I try and tell the truth, and no one believes me.
Murphy: *smirks*
Kirmani: Do something about these socks, and maybe I'll believe you.
Dresden: That is beyond the power of even the greatest wizard.

And then the rest would happen about the same, only before Harry left, he'd spell Kirmani's socks not to suck.