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:       Philip , I was really glad to hear about your award . Congratulations ! 
 Person2:Thanks , Denise . Actually , I was really surprised . I mean , there were a lot of qualified people out there . 
 Person1:        Sure . But the work you did was really exceptional ! You definitely deserved it ! 
 Person2:Thanks a lot . I expect to see your name nominated pretty soon , too . You ’ Ve been doing some great work ! 

informal