2 sentences

1. 请问您的分机号是多少？

   qǐng​wèn nín de fēn​jī hào shì duō​shao?

   May I ask what your extension number is?

   Source: Dong Chinese Dictionary

2. 请拨打总机转分机204。

   qǐng bō​dǎ zǒng​jī zhuǎn fēn​jī204.

   Please call the switchboard and ask for extension 204.

   Source: Dong Chinese Dictionary