Hi . I need a wake-up call tomorrow .   What time would you like your wake-up call ?   I need two calls , one at 7 and another at 7 fifteen .   That is no problem at all , of course . You'll get a call at 7 o'colock and another at 7 fifteen .   Then again , I think 7 fifteen is too early . Change 7 fifteen to 7 thirty , please . 