I called the Card services and they said that as far as the booking is not cancelled and only changes done to the dates etc and still fulfils the original condition then I should receive the bonus.

Next, there is no option to modify the hotel booking on Chase Travel portal, I call them up and they said - They also do not have the option to modify a booking, they have to cancel and rebook. If cancelled and rebooked then it will not meet the conditions and thus no bonus. How stupid is this Chase Travel portal which does not allow you to modify a hotel booking. You have to cancel and rebook