we have assigned     [name of rep]    as our new representative for your area.     [name of rep] has been with our firm for quite some time and is extremely experienced in all aspects of our production.

　　[name of rep]     will be coming to  [name of city] on     [date]     and will be calling on you in the morning if that doesn't conflict with your schedule. if there is any problem with that date， please let us know.