xiànchǎng bú quèdìng shí, kěyǐ zhíjiē shuō xūyào quèrèn, dàn yào gěichū huífù shíjiān

现场不确定时，可以直接说需要确认，但要给出回复时间。

When you are unsure on-site, you can directly say you need to confirm, but you should provide a response time