You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.

Person1: I ' m betting the New York Yankees win . How about you ?
Person2:Well , I ' m favor of the Red Sox . They ' Ve had a good season .
Person1: Sorry , guys . Could I just interrupt for a moment ? My money is on the Yankees !
Person2:That ' s not a very good pick . I ' m against the Yankees .
Person1: Hey , Ken . Good luck if you already put your money on the Red Sox .
Person2:Yeah , I ' m with you on that .
formal