zhòngdiǎn shì shuōqīng wèishénme xūyào zhège shíjiān bǐrú wǒ hǎo dìng piào wǒ hǎo quèrèn rénshù

重点是说清为什么需要这个时间，比如“我好订票”“我好确认人数”。

The point is to clearly explain why you need this time, such as 'so I can book tickets' or 'so I can confirm the number of people.'