Internal candidates who unsuccessfully apply for a job are twice as likely to leave as staff who are successful or don’t apply for a position at all. Rather than hiring one person just to lose another, take the time to sit down with the internal applicant face to face and explain that they are a valued member of the company. Provide clear, constructive reasons why they weren’t selected and let them know of any training sessions the company offers that might benefit their prospects in the future.
You can consider the above mentioned, how do you tell a candidate they were not selected examples or customize them to convey the message politely and effectively.