You made it to the last step of the interview process, step number seven: regret letters. The purpose of a regret letter is to professionally and respectfully thank the candidate and applicants, and inform them that they are no longer being considered for the position for which they applied.
The regret letter should be printed on letterhead and reads as follows: "Dear applicant, We have received your resume for the Patient Communication Facilitator position with ABCD Eyecare and appreciate you taking the time to express your interest. Although we were impressed with your background and experience, we regret to inform you that we have decided to pursue other applicants who more closely reflect the requirements for the position and needs of the practice. We wish you well in your employment search. Sincerely, company representative and title."
Go ahead and sign this letter as well in blue ink. Insert it into a letterhead envelope and send as soon as your final hire has determined their start date.