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've heard that Tom is going to move . 
 Person2:What ? Are you sure about that ? 
 Person1:        Yeah , he is going to move next month . 
 Person2:Where is he going ? 
 Person1:        He is going to Canada and to live with his son . 
 Person2:What a pity ! 
 Person1:        Why did you say that ? It's a good thing for him to live with his son . 
 Person2:I know that . But it's pity for us to lose such a good neighbour . You know I always appreciate Tom's company . 
 Person1:        Me too . But anyway we hope he lives happily in the future . 

informal