我有事，不能和你相聚，请谅解。
热心网友
Excuse me,I' m too engaged/busy to meet you.
热心网友
I am so sorry for my absentation because i have something to do. Thanks for your consideration!
热心网友
I am so sorry for my disappearance because i have something to do. Thanks for your understanding!
热心网友
sorry,ican' ankyouforyourunderstanding.