You have been studying in a foreign country for the last two years and your Visa is going to expire next june . You are going to take three months professional course .
Write a letter to the embassy. In your letter
Introduce yourself
Explain your situation
Request for extension of your Visa
Write a letter to the US embassy to change the date of your appointment
You have been staying in a foreign country for the last two years, and your visa is about to expire next June. However, you are planning to take a three-months professional course. You will need a visa extension.
Write a letter to the consular in the embassy and ask for an extension on your visa.