Here's a Mandarin Chinese Dialogue showing how to greet, seat, serves, and otherwise host old friends..

+ Nǐ hǎo. (Hello.)

- Dí Tàitai! Hǎo jiǔ bú jiàn! (Mrs. Di! Long time no see!)

+ Zhēnde hǎojiǔ!(It really has been a long time!)

- Qǐngzuò. Qǐngzuò. (Sit down. Sit down.)
- Lái hē yībēi shuǐ. (Here, drink a glass of water.)

Contuined..