This structure can be used to talk about plans, intentions and decisions that have already been made.
I am (‘m) going to phone him.
You are (‘re) going to meet her.
He/She is (‘s) going to write it.
Am I going to meet him later?
Are you going to see her soon?
Is he/she going to write it?
I’m not going to phone him.
You’re not going to see her.
He/She isn’t going to write it.