-Was the gentleman’s name David? -No. I don't think so, but , go on, please.
many thanks
I’d like to
not at all
never mind. Our manager is not in right now.
本题考查日常交际用语。句意；—那位先生的名字是大卫吗？-不，我觉得不是，但没关系，请继续吧。Many thanks 非常感谢;I’d like to 我想,我愿意;not at all 一点也不;never mind没关系，不用担心。根据语境，本题选D。