Dear Sir:
Wish you a nice day.
This is Li Ming comes from XX company.I am sincerely writing this email to apologize that we could not send sample you required timing because of some reason.but what we can promise is that we will absolutely send it out by the end of this month,and hope it would not troble you.
This delay situation seldom happen which also out of our expectation,pls understand.if any problem pls feel free to call me.
Yours
LiMing