To have to provide a non-favourable reference for an employee

To have to provide a non-favourable reference for an employee [Date] [Name] [Address] Dear [Name] Thank you for your letter of [date] concerning [name]. I can confirm that [name] was employed by us as a [title] from [date] until he [she] left in [date]. Should you require further information you can telephone me on [number]. Yours Sincerely [Your Name] [Your Title]