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: He said he will get married by the end of this month .
Person2:Big talk , I ' d say . He does not have a girlfriend yet .
Person1: Who knows . After all , he is handsome and rich .
informal