Damian is training with Dick, but constantly missing, while Dick talks a lot on how Damian is trying to anticipate to much. Damian will need to sound frustrated, but once Dick tells him how this is new for both of them and they'll have to become their own people in the role of Batman and Robin, Damian will have to convey the sense of reluctant but optomistic understanding (like when a child is given a lecture and gives in that the words of advice they have recieved are truly wise). 

A male or female can play this role, but it has to sound like a 9-13 year old boy. It can sound like a normal American boy that age but Damian's upbringing also shows he has this sense of formality to the way he talks, even when he's being a brat. This proper way to how he speaks. That's not as important for this, but if you can convey that, it's welcomed.