Well, Hermione Granger,

[ said with some skepticism, as if he isn't sure the name is quite legit nor the girl attached to it if she makes such ludicrous proposals such as this one ( of course it's poisoned. or tempered with by some arse of a sorcerer or worse fairy). ]

We cannot be entirely sure of such, hence, we are not taking any unnecessary risks. It is best not to receive favors from kidnappers.