Formal:
* 不客气 (bù kè qì): This is the most common and polite way to say "you're welcome" or "my pleasure." It literally means "not polite."
* 不用谢 (bù yòng xiè): This means "no need to thank," and is another polite way to respond to thanks.
* 没关系 (méi guān xí): This means "it doesn't matter," and is often used in situations where you're not really doing something special.
Informal:
* 不用客气 (bù yòng kè qì): This is the informal version of "不客气," and is more suitable for friends or family.
* 没事 (méi shì): This means "no problem," and is a casual way to say "you're welcome."
More direct:
* 很高兴为你服务 (hěn gāo xìng wèi nǐ fú wù): This literally means "I'm very happy to serve you," and is a more direct way to express "my pleasure."
The best way to choose the right phrase depends on the specific situation and your relationship with the person you are speaking to.