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: The baby is crying again .
Person2:Leave him alone , he ' ll soon stop .
Person1: How can you do so ? Perhaps something is wrong with him . Let ' s go and see him .
Person2:OK . Nothing serious . He just wants us to be with him .
informal