Manisha Koirala says she feels honoured to play the role of Sanjay Dutt's mother (late actress Nargis Dutts role) in Rajkumar Hirani's upcoming film Sanju.Manisha interacted with the media on the sidelines of Yusuf Merchant's book "Happiness - Life Lessons From A Creative Addict" here on Saturday.On being a part of Sanju, Manisha said: "I am really honoured to have played Nargis Duttji in the film. It's like any actress' dream role. It's a special appearance, but I am really excited to know audience reaction about my role and the film."Sanju, a biographical film based on the life of Sanjay Dutt, is directed and written by Rajkumar Hirani and produced by Vidhu Vinod Chopra.The film stars Ranbir Kapoor as Sanjay Dutt in various stages of his life. It has an ensemble cast which includes Anushka Sharma, Sonam Kapoor, Paresh Rawal, Manisha Koirala, Jim Sarbh, Vicky Kaushal, Boman Irani, Dia Mirza and Karishma Tanna. The film is set to be released on June 29.