Given the task definition and input, reply with output. 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: Every teacher likes him .
Person2:They say he can sum up like winking .
Person1: How he manages to do that is always a mystery to me .
Person2:Maybe he's gifted in that .
informal