Definition: 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'.
Input:  Person1:       Hey , there ’ s Leo . I wonder why he ’ s walking arm in arm with that young woman .  
 Person2:It ’ s as plain as the nose on your face . They ’ re dating each other .  
 Person1:        You ’ re pulling my leg ! She must be thirty years younger than Leo . Talk about robbing the cradle !  
 Person2:Well , you can bet this relationship ’ s going to be a flash in the pan .  
 Person1:        It must have been love at first sight because I know he didn ’ t have a girlfriend last week .  
 Person2:I think you are absolutely right . Actually , my father proposed to my mother after knowing her only two weeks . They got married a month later . 

informal