很抱歉打扰您,由于领导行程变化,需要取消我之前预定的两间房间。为此给你带来的不便，深表歉意！ I'm awfully sorry to disturb you, but because of the change of my leader's schedule, I have to cancel the two rooms booked before. Sorry for the inconvenience that may have caused you.
Sorry to disturb you。 Because our leader changed his schedule， I should concel two rooms I had booked。 I am sorry for these inconveniences。
Sorry to bother you, we apply to cancel the two rooms which I booked before because of the change of our leader's schedule. Sorry for the inconvenience.
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