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:       Greg . I want to speak to you for a minute .  
 Person2:Yes . Ms . Gray . Is there something wrong ?  
 Person1:        I ’ m afraid there is , Greg . I don ’ t mind you taking a break . But you ’ Ve been away from your desk for twenty-five minutes already .  
 Person2:I ’ m sorry , Ms . Gray . I must have lost track of the time . I ’ ll get back to work , now . 

formal