How to check into a hotel in Chinese

我有预订。 — wǒ yǒu yùdìng — I have a reservation
我用这个名字订的房间。 — wǒ yòng zhège míngzi dìng de fángjiān — I booked a room under this name
我订了房间，名字是…… — wǒ dìng le fángjiān, míngzi shì... — I booked a room, name is...
我想入住。 — wǒ xiǎng rùzhù — I want to check in
我想办理入住。 — wǒ xiǎng bànlǐ rùzhù — I want to check in
这是我的护照。 — zhè shì wǒ de hùzhào — Here's my passport
几点退房？ — jǐ diǎn tuìfáng? — What time is departure?
早餐在哪里？ — zǎocān zài nǎlǐ? — Where's breakfast?
Wi-Fi密码是多少？ — Wi-Fi mìmǎ shì duōshao? — What is the Wi-Fi password?
我的房间在哪里？ — wǒ de fángjiān zài nǎlǐ? — Where is my room?
房卡开不了门。 — fángkǎ kāi bù liǎo mén — The room card does not open the door
房间里没有热水。 — fángjiān lǐ méiyǒu rèshuǐ — There is no hot water
可以换房间吗？ — kěyǐ huàn fángjiān ma? — Can I change rooms?
可以寄存行李吗？ — kěyǐ jìcún xíngli ma? — Can I leave my luggage?
可以延迟退房吗？ — kěyǐ yánchí tuìfáng ma? — Is it possible to check out late?
我要发票。 — wǒ yào fāpiào — I need an official receipt
请稍等。 — qǐng shāo děng — Wait please
请出示护照。 — qǐng chūshì hùzhào — Show your passport
预订人姓名是什么？ — yùdìng rén xìngmíng shì shénme? — What name is the reservation for?
需要押金。 — xūyào yājīn — Deposit required
明天中午十二点退房。 — míngtiān zhōngwǔ shí'èr diǎn tuìfáng — Departure tomorrow at 12:00
密码在房卡上。 — mìmǎ zài fángkǎ shàng — The password is on the room key card
早餐在二楼。 — zǎocān zài èr lóu — Breakfast on the second floor

Mini dialogue

你好，我有预订。我想入住。 — nǐ hǎo, wǒ yǒu yùdìng. wǒ xiǎng rùzhù. — Hello, I have a reservation. I want to check in.
好的，请出示护照。 — hǎo de, qǐng chūshì hùzhào. — Okay, show me your passport.
这是我的护照。我订了房间，名字是…… — zhè shì wǒ de hùzhào. wǒ dìng le fángjiān, míngzi shì... — Here's my passport. I booked a room, name -...
请稍等。这是房卡。明天中午十二点退房。 — qǐng shāo děng. zhè shì fángkǎ. míngtiān zhōngwǔ shí'èr diǎn tuìfáng. — Please wait. Here is the card from the room. Departure tomorrow at 12:00.
Wi-Fi密码是多少？ — Wi-Fi mìmǎ shì duōshao? — What is the Wi-Fi password?
密码在房卡上。 — mìmǎ zài fángkǎ shàng. — The password is on the room key card.
明天可以寄存行李吗？ — míngtiān kěyǐ jìcún xíngli ma? — Can I leave my luggage tomorrow?
可以。 — kěyǐ. — Yes, you can.

Cultural hint

A passport is always needed at hotels in China. Some hotels may also ask for a deposit 押金 (yājīn - “deposit”). If you are on a business trip and need an official document for reimbursement, ask for 发票 (fāpiào - “official receipt / invoice”). If the key card does not open the door, 房卡开不了门 (fángkǎ kāi bù liǎo mén - “the room key card will not open the door”) is clearer than just saying “it does not work.”