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:       Excuse me , Ms . Montgomery ?  
 Person2:I ’ m sorry , Jeff . Please don ’ t interrupt me right now . I ’ m in the middle of a conversation .  
 Person1:        Oh , I ’ m sorry , Ms . Montgomery . I ’ ll come back later .  
 Person2:That ’ s all right . I ’ ll be finished in a little while . 

informal