The Basic Mandarin Chinese Phrases and the Mandarin Chinese Phrases for Meeting and Greeting will bring you to the Mandarin Chinese Dialogue.Here i listed some usefull Chinese words and phrases which can help you.

Basic Chinese Phrases
你好!Ní hǎo Hello
谢谢 Xiè xie Thank you(不用谢 Búyòngxiè it’s nothing/You’re welcome)
对不起!Duì bu qǐ!I’m sorry (没关系!Méi guān xì  That’s all right! OR 没事 Méishì Nothing)
再见 Zài jiàn Goodbye
回头见! Huítóu jiàn! See you later!
早上好/ 早 zǎo shàng hǎo/ zǎo  Good morning
晚安  Wǎn ān  Good night
请问 Qǐng wèn Excuse me (I have a question)
请问您贵姓? Qǐngwèn nín guìxìng?May I have your surname?
欢迎!Huān yíng!Welcome.
请坐!Qǐng zuò!Take a seat, please.
请喝茶!Qǐng hēchá!Please help yourself to tea.
干杯! Gānbēi! Cheers!
很好 Hénhǎo Very good
请结账 Qǐng jiézhàng The check, please
这个 Zhège This
那个 Nàge That
是 Shì Yes, it is, to be
不是 Búshì No
我喜欢 Wó xǐhuan I like it
好不好?Hǎo bu hǎo? Is it OK?
太好了 Tài hǎo le.That’s good.
什么?Shénme? What?
一点 Yìdiǎn A little
不客气 Búkèqì You’re welcome
没问题 Méi wèntí No problem
恭喜! Gōngxǐ!Congratulations!
当然 Dāngrán Of course
我懂 Wó dǒng I understand
真棒!Zhēnbàng!Awesome!
请让一下 Qǐng ràng yí xìa  Please get out of my way
救命!Jiùmìng!Help!
方便吗?Fāngbiàn ma? Will it be convenient for ….
吃饭了吗? Chīfàn le ma? Have you eaten?

Basic Responses
嗯  èn  Yes/I agree/I heard you
好的 hǎode Okay
不用 Bú yòng No need

Money
这个多少钱?Zhègè duōshǎo qián? How much is it?
太贵了 Tài guìle.It’s too expensive.
能便宜一点吗?Néng piànyí yīdiǎn ma?Can it make a little cheaper?
自动取款机 Zìdòng qúkuǎnjī ATM (money machine)

Toilets
厕所在哪里?Cèsuǒ zài nálǐ? Where is the bathroom?
女性 Nǚxìng Female/男性 Nánxìng Male
卫生纸 Toilet Paper wèi shēng zhĭ

You may see
Entrance rù kŏu 入口
Exit chū kŏu 出口
购物中心 Shopping Center (as in Shopping Center) Gòuwù zhōngxīn
超市 Supermarket
禁止吸烟 No smoking

You may hear
欢迎光临!Huān yíng guāng lín! Welcome!
好吃吗 Hǎochīma? Is the food okay? 很好吃!Hěn hǎochī!Very Delicious
这里能上网吗?Zhèlǐ néng shàngwǎng ma? Can I get Internet access here?
老外 Lăo wài Foreigner
听得懂吗? Tīng de dŏng ma? Do you understand? (listening) [Yes/No] 听不懂 Tīng bù dǒng.I don’t understand.请再讲一遍 Qǐng zài jiǎng yíbiàn.Repeat it, please