Shruti Hassan's dates given for Dammu have gone wasted as NTR wasn't available at that time. NTR Junior gave away the dates given for Dammu to Oosaravelli to ensure its release for Dussera. Hence, Shruti Haasan's dates were wasted and now she is busy with other assignments and couldn't give bulk dates for Dammu.
Shruti tried her best to not to walk out of Dammu, but the packed schedules planned for this film in the next few months, didn't help the cause. Shruti is right now busy with Gabbar Singh and Tamil movie 3 and therefore wished Dammu team good luck and walked out. Now the team of Dammu have to find a suitable heroine and it will surely take some time as all the top rated heroines are busy at the moment.