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:       I wonder what he looks like . Oh , I can't wait to see him ! His email said he'd be wearing a white hat . ( looking around for him ) oh , there he is .  
 Person2:hey , Isabelle ...  
 Person1:        Logan ! Why on earth are you hiding here ? White hat ! Come on ! Don't tell me you're the guy ! It can't be true .  
 Person2:yes , I am the guy .  
 Person1:        what a bummer ! You set me up ?  
 Person2:let me explain . I didn't mean to hurt you ...  
 Person1:        how dare you !  
 Person2:hang on a second . Hear me out , just this once , Isabella !  
 Person1:        why did you lie to me in the email ?  
 Person2:I didn't lie . You just didn't ask me my real name .  
 Person1:        I should have known it was you . No wonder all the 20 questions were answered correctly . I thought I might have found the one for me .  
 Person2:I'm sorry . It was cruel of me . But I promise it will never happen again ? Look , there's a nice restaurant . Let me take you to dinner and we can talk things over . 

informal