Allow him/her to come out as much as possible. That is what they do when they want out. If it's a hand fed bird, especially a young one they don't take long. I've had cockatiels who want my affection immediately, I went to a bird store once and had one that ran up my arm and refused to leave. I couldn't take her at that moment but I went back the next day and she gleefully ran up to me and I brought her home. If they decide you are the one, they want to be with you literally all the time