Dear Mr. Thompson,
I hope you are doing well. I am Sarah and I was recently accepted into your summer internship program. I am writing to inform you that I have a problem with the internship program start date. Unfortunately, I realized that on the start date, I have to take my final exams at university. They are very important for my academic success and future career.
I would be grateful if you could allow me to begin the internship a few days later.
Thank you for your understanding. I look forward to your reply.
Sincerely,
Sarah
