You have promised to give a sample of your product in person to Mr. John Smith, your customer, tomorrow, but you won’t be able to go, because you were just told to attend a meeting.Write an email to Mr. John Smith,1) apologizing for changing your plan;2) explaining the reason for the change;3) telling him your new arrangement.You should write about 100 words. Do not sign your own name at the end of your email.Use "Wang Lin" instead.