wǒ yào zhíjī
I need to check in for a flight
这是您的登机牌。
This is your boarding pass
This is a polite statement: 这 (zhè) means 'this', 是 (shì) means 'is', 您的 (nín de) means 'your' (polite), 登机牌 (dēngjīpái) means 'boarding pass'.
Use this when handing a boarding pass to someone, often said by airline staff. It's polite due to 您 (nín). Don't use it for asking for a boarding pass; it's for giving one.
“This is your boarding pass” in Chinese is 这是您的登机牌。 (zhè shì nín de dēngjīpái).
这是您的登机牌。 is pronounced zhè shì nín de dēngjīpái.
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