May I help you ?   Yes . Do you exchange foreign money here ?   Yes . Our bank is authorized to deal with foreign exchange .   What kinds of currency do you change ?   We can change only three kinds of currency , USD , Japanese Yen and HK Dollar in our savings office .   Could you tell me what the exchange rate for USD is today ?   The buying rate is 826 . 44 yuan for 100 dollars .   I want to change some Us dollars to cover my expense here . 