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 think Bill Clinton is a good president . 
 Person2:But he has the sex scandal . 
 Person1:        Well . Maybe he isn't a good husband , but he is a successful president . 
 Person2:I agree . He is also an excellent speaker . 
 Person1:        Yes , he is . Of course he makes mistakes , but who doesn ’ t . 
 Person2:yeah , it ’ s fair to say so . 

informal