In those cases you should use "하십시오"style which was called "합쇼(hapsyo)"style before, in the other hand "해요"style is commonly used in everyday Korean. \^o^/

When speaking to an audience, mostly Hapsyo-che is used and sometimes Haeyo-che is used Through writing, mostly Haera-che is used and sometimes Hapsyo-che is used Quoted from http://en.wikipedia.org/wiki/Korean_speech_levels Hapsyo-che is used between strangers at the start of a conversation among male co-workers by TV announcers to customers in certain fixed expressions like 만나서 반갑습니다 "Pleased to meet you" Haeyo-che is used mainly in Korean phrasebooks for foreigners between strangers, especially those older or of equal age between female co-workers or friends by younger speakers as a less old-fashioned alternative to the hao-che. by men and women in Seoul as a less formal alternative to the hapsyo-che. Haera-che is used to close friends or relatives of similar age, and by adults to children in impersonal writing (books, newspapers, and magazines) and indirect quotations ("She said that...") in grammar books, to give examples in some exclamations