Austin Parker
123, X Street, Y Avenue
Manhattan, NY-10009
Cell:-(123) 456-7890
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Austin Parker,
I regret to inform you that we will have to cancel the tour that your group had planned at the plant next Monday. We have to complete an urgent order and this includes the use of chemicals that can be hazardous to the health. That is why we have cancelled all tours in the upcoming days
I apologize for this inconvenience but I am sure that you understand that your safety is of utmost importance and concern for us. If you are still interested please reschedule another date later.
Sincerely,
Petterson