3 sentences

1. 如果你想先走，那就请便吧。

   rú​guǒ nǐ xiǎng xiān zǒu, nà jiù qǐng​biàn ba.

   If you want to leave first, please go right ahead.

   Source: Dong Chinese Dictionary

2. 好吧，请便。

   hǎo ba, qǐng​biàn.

   Fine, go ahead.

   Source: OpenSubtitles

3. 到了这里就像在自己家一样，请便。

   dào le zhè​lǐ jiù xiàng zài zì​jǐ jiā yī​yàng, qǐng​biàn.

   Make yourself at home; do as you please.

   Source: Dong Chinese Dictionary