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:       Who is this on the water buffalo ?  
 Person2:That's my grand-father . He was a farmer . When he was young , he had to take the water buffalo to graze in the field .  
 Person1:        Oh yes , that was the best job in most farm families . That's where many of them learned to play the flute .  
 Person2:My grandfather did that too . He used the time to study instead .  
 Person1:        That's interesting . Go on !  
 Person2:My grand grandfather was a merchant who ran a small business . He couldn't afford to send my grand father to school .  
 Person1:        So he became a self-taught man ?  
 Person2:Right . Later he was a soldier and a fireman in the village . When he was middle aged , he became a great man , quite famous .  
 Person1:        In what field ?  
 Person2:As a leader of police officers in charge of the whole country .  
 Person1:        Is he still in that that type of work .  
 Person2:No . He retired from that . He is a senator now .  
 Person1:        Would you want to be a senator ?  
 Person2:Well , maybe when I get old . But first I'll be a lawyer . 

informal