20 street ,london
Dear Mr.Jack (to whom you are addressing)
I am looking forward to attend the ___________ (specify whicappointment) appointment that you have arranged with me, I will be at your ________(time) at your main instiution ________(venue of appointment) to attend the checkup on your ________. Thank you for this opportunity and am much more than ready to work for you.
If there is any problem concerning the date set above, please do not hesitate to contact me on my telephone number: __________. Thank you for this great chance.