你嗰句無乜問題, 通常口語化都係咁講, 唔係寫formal letter...
我都係簡單講"Good morning Mr. xxx! Welcome to Hong Kong (如果對方一落機就上你公司)/Nice to meet you! This way, please." 通常一路行會問候下對方, 至於介紹自己反而係入房見到老闆後先做或派片.
更禮貌我會講, Gd morning Mr. Foreigner, I am xx's assistant, nice to meet you. May I show you the way to the conference room? Would you like something to drink?