You have sent a cover letter with your resume, and now you want to write a follow-up cover letter because nobody replied to you yet. You can use this template and customize it further.
Dear [Hiring Manager],
I hope you have had a chance to review my resume and cover letter. I am very interested in the [position] opening and would love to come in for an interview.
{Optional: I am attaching a follow-up cover letter that further explains my qualifications for the position.}
I would appreciate the opportunity to discuss my qualifications with you in person. Thank you for your time, and thank you for considering me for the position. I am very excited about the opportunity and believe that my skills and qualifications would make me a valuable asset to your team.
I would be happy to provide any additional information or answer any questions you may have. I look forward to hearing from you soon.
Sincerely,
[Your Name]