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:       There's going to be a highway here .  
 Person2:That's better .  
 Person1:        The traffic problem will soon be eased .  
 Person2:I think so . 

informal