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:       We should keep Frank at arm's length .  
 Person2:Yeah . He's known as a sly dog . He's done many people in .  
 Person1:        He hits below the belt .  
 Person2:And he may cash in on people whenever chances are provided . 

informal