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:       Hi , Martin . I ’ Ve been looking for you all morning . 
 Person2:What ’ s up ? 
 Person1:        I want to say goodbye . I ’ m leaving for America tomorrow . 
 Person2:America ? Did you get admit to MIT ? 
 Person1:        Yes . 
 Person2:Congratulations ! Susan . I ’ m so happy for you . 
 Person1:        Thank you . 
 Person2:Really going to miss you . 
 Person1:        Me too . I ’ ll write to you once I get settled . But I have so much to do . You might have to wait a while . But I really will write to you . I love to write letters . I think it ’ s more meaning than the emails even than the phone call . 
 Person2:Ok . Take care . Have a nice journey . 
 Person1:        Thank you . 
 Person2:Look after yourself . Bye . 
 Person1:        Bye . 

informal