wǒ yào zhíjī
I need to check in for a flight
值机柜台在哪里?
Where is the check-in counter?
The phrase uses 值机柜台 (check-in counter), 在 (at), and 哪里 (where). The structure is a location question: [place] + 在 + 哪里.
请问值机柜台在哪里?
qǐngwèn zhíjī guìtái zài nǎlǐ?
Excuse me, where is the check-in counter? — More polite due to adding 请问 (excuse me).
值机处在哪儿?
zhíjī chù zài nǎr?
Where's check-in? — More casual and shorter, using 处 (place) and 哪儿 (where).
请问值机柜台在哪里?
qǐngwèn zhíjī guìtái zài nǎlǐ?
Excuse me, where is the check-in counter?
就在那边,靠近入口。
jiù zài nà biān, kàojìn rùkǒu.
It's right over there, near the entrance.
Appropriate
Avoid when
You say '值机柜台在哪里?' (zhíjī guìtái zài nǎlǐ?).
It is pronounced 'zhíjī guìtái zài nǎlǐ?' with the tones: zhí (2nd tone), jī (1st tone), guì (4th tone), tái (2nd tone), zài (4th tone), nǎ (3rd tone), lǐ (3rd tone).
Use it at the airport when you need to locate the check-in counter for your flight. It is a polite and clear way to ask for directions.
Tomyo
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