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:       Harry , do you like the opera ?  
 Person2:No , not really .  
 Person1:        Why is that ? It is called real art .  
 Person2:Well , it's very expensive and they're usually singing in another language . That kind of gets on my nerves .  
 Person1:        Yeah , that makes sense . 

informal