He cited Modi as noting, "the true power and potential in this relationship is that when the oldest and largest democracies come together, the world will benefit."

Verma acknowledged that India and US "will have our differences from time to time - close friends often do - but when we do have differences, it is imperative that we maintain a healthy dialogue."

Expressing deep appreciation of all those who have worked so hard on cultivating this relationship over many decades," he also acknowledged the contribution of immigrants from the Indian subcontinent.

They "took a chance like my parents, who worked hard, who continue to pursue their dreams, and along the way have helped ensure India and the United States become the closest of friends and partners," Verma said vowing to "strive to live up to the high standards they have set."

The New Delhi post has been vacant since the previous ambassador Nancy Powell quit in May after India-US ties hit a low following a major diplomatic spat over the December arrest and strip search of Indian diplomat Devyani Khobragade in New York.

Kathleen Stephens, a career foreign service official has served as chargé d'affaires in New Delhi since July.