Before appointment of with the expensive department, because myself unique important matter needs toward to handle personally, therefore the agreement time originally now needs changes and cancels.
But myself hope again approximately the time, but explains question and the effect in detail this policy.
Requests respectfully the excuse me
I am sorry for canceling (到底是更改還是取消?) the appointment beacause of an emergency.
I would like to have an new appointment with you to explain the effect and problem of this policy. (你要對上司還是下屬還是大家都 "咁高咁大" 呢?)
Sorry for the inconvenient causes.