Wǒde péngyou men, jīntiān nǐmen guò de zěnmeyàng? Wǒ jīntiān fēicháng kāixīn, yīnwèi wǒ rènshi le yí gè xīn de péngyou, tā shì Měiguó rén, jīntiān gānggāng dào Shànghǎi. Actually we met at the entrance to the bank and he wanted to exchange his American dollars but couldn't speak Mandarin, so I of course wanted to help him with his money exchange! This will definitely be a challenge for you so let me give you some useful words and sentences to smoothen things out!