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:       Congratulations on your success in the competition . That is quite something . 
 Person2:Thank you . I was lucky this time . 
 Person1:        I think luck played a very small part in your victory . It is solely due to your hard work and efforts . That brings honor to you and joy to us . 
 Person2:I am flattered . 
 Person1:        It is real word . 
 Person2:Thank you very much . 

informal