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:       Hello , Mary . What ’ s the matter with you ? You look upset .  
 Person2:My friend and I was argued with each other . For this , I ’ m very sad . Because I don ’ t want to lose this friend .  
 Person1:        Oh , I ’ m sorry to hear that . I know how you feel . Please don ’ t be sad .  
 Person2:Thank you , but I really want to relax myself . I ’ m very sorry .  
 Person1:        OK . Don ’ t let it get to you . Goodbye . 

informal