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:       The principal just announced that Dr . Smith is going to take over as dean of our department .  
 Person2:Oh .  
 Person1:        Why are you so calm ? Are you not surprised to hear this ?  
 Person2:No , I knew it all along . He was the obvious choice .  
 Person1:        Do you think he can do well ?  
 Person2:A new broom sweeps clean anyway . 

formal