It's a pleasure to meet you to, ah, Mister...?

[He hasn't given her his name yet, but she's eager to help without a name anyway.]

I haven't been surprised with a party, no... [Surprised by other things, yes, but parties no.] But I suppose if someone were going to surprise me with a party, I would feel terrible if I had made plans for the day. So I guess the first step would be to make sure that whatever day you pick for the party, she doesn't have anything else to do.