Quick Tip:
It is customary to add a honorary suffix to the last name of a customer or someone who you do not know well. Xiānshēng（先生）is for men and Nǚshì（女士）is for women.
Basic greeting:
早安 (Zǎo ān) 凱利 先生/女士 - Good morning, Mr./Ms. Kelly
你好 (Ní hǎo) 凱利 先生/女士 - Hello/Good day, Mr./Ms. Kelly
晚安 (Wǎn'ān) 凱利 先生/女士 - Good evening, Mr./Ms. Kelly