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:       How I wish my son Mark could be as excellent as your Joe ! 
 Person2:Don ’ t be too humble . Few young men could be equal to Mark . And in some respects Joe and Mark are neck and neck . 
 Person1:        I agree . Both Joe and Mark are men of guts . 

informal