ICICI Bank — convert saving account to salary account

Address:

Kamrup Metropolitan, Assam, 781005

I have a saving account at icici bank iit guwahati branch (Assam), now i want to convert my saving account to salary account. I have visited my bank but bank manager did not respond well. So, just want to know that can i convert saving account to salary account? And yes what is the procedure? What document required to convert my saving account to a salary account?