Chinese phrase
如有变动，请及时告知 rú yǒu biàn dòng qǐng jí shí gào zhī
Meaning
Please let me know promptly if there are any changes
When to use it
A polite request for prompt notice of any changes. It is common in messages about plans, dates, or arrangements and has a somewhat formal tone.
Example dialogue
签证材料的截止日期是下周五，如有变动，请及时告知。 qiān zhèng cái liào de jié zhǐ rì qī shì xià zhōu wǔ rú yǒu biàn dòng qǐng jí shí gào zhī
The deadline for the visa documents is next Friday. Please let me know promptly if there are any changes.
好的，有任何变化我会第一时间通知你。 hǎo de yǒu rèn hé biàn huà wǒ huì dì yì shí jiān tōng zhī nǐ
Okay, I will let you know right away if anything changes.