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:       Quite a few times , I had my back to the wall .  
 Person2:Really ? Generally they will turn out to be a good thing .  
 Person1:        That ’ s right .  
 Person2:You ’ ll exert all your energy and get out of it . 

informal