He is either scared or distracted.
Also remember, when you ask your bird to do things, they are just that; a request. It is not a command, your bird will not do what you ask of him 100% of the time.
Try taking him to new rooms on your shoulder and let him just be there. Don´t ask him to do things at first. Just let him sit and look and see what is going on and look around the room. When he is more comfortable in new rooms you can start practising recall.
He always flyes in another room. I don't why he is busy yet.He might be scared. Your tiel is young still. It took my cockatiel months before he was comfortable going to different rooms.
Thanks for worry about CoCo.Did you get him back?
How did he escape?
Edit:
I´m not sure how popular @parrotalert Lost and Found Parrots / Birds - Parrot / Bird Reporting and Alerting Register is in Iran.
Have you posted picture in facebook groups?
Walked around the streets calling him?
Gone around the neighbourhood with pictures asking if anyone has seens him?
Checked neighbours gardens?
Checked on top of apartment building roofs?
Looked in the local park in the trees?
Hung posters on local lampposts and in local meeting points - coffeeshops etc?
Advised local animal services (the pound, rescue centres)?
Drop a poster off at the police station, fire station?
Thanks for worrying for CoCo.I’m so sorry to hear that he go out. Any updates? I got my tiel back after four days, and many people have gotten their birds back after they were out longer than that, so don’t give up!
I tell them and I'm living in an apartment. I can't find the organization for rescue. I'm the only rescuer for CoCo.What is your neighbourhood like?
Is it houses or blocks of apartments?
Have you told the neighbours you lost him?
Did you advise police and rescue centres?
How did he escape?