2 sentences

1. 营业员正在为顾客包装刚买好的礼品。

   yíng​yè​yuán zhèng​zài wèi gù​kè bāo​zhuāng gāng mǎi​hǎo de lǐ​pǐn.

   The shop assistant is wrapping the gifts the customer just purchased.

   Source: Dong Chinese Dictionary

2. 那位营业员正在耐心地向顾客介绍产品。

   nà wèi yíng​yè​yuán zhèng​zài nài​xīn de xiàng gù​kè jiè​shào chǎn​pǐn.

   The sales clerk is patiently introducing products to the customers.

   Source: Dong Chinese Dictionary