When addressing a letter to Indian clients Veera Ashok Kumar Reddy Raya and Kevari Saritha, start with "Dear Mr. Reddy and Ms. Saritha," or simply "Dear Veera Ashok Kumar Reddy Raya and Kevari Saritha," depending on the level of formality you wish to convey. Ensure to use their full names as a sign of respect. Follow this with the body of your letter, maintaining a polite and professional tone throughout.