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:       If you fall in love like him , you will go soft in the head , as well .  
 Person2:Come off it .  
 Person1:        You want a bet ?  
 Person2:Why not ? 

informal