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:       The bridegroom looks a bit nervous .  
 Person2:On this occasion , most people do .  
 Person1:        Oh , they are playing the wedding March . Here they come .  
 Person2:She is a beautiful bride .  
 Person1:        I am so happy for them .  
 Person2:Are you crying ?  
 Person1:        Yes , I always cry at weddings .  
 Person2:Harris and Anne are perfect for each other .  
 Person1:        Yes , they are .  
 Person2:You and Tom also make a great couple .  
 Person1:        In fact , we are beginning to make preparations .  
 Person2:For the wedding ?  
 Person1:        No , no , for the engagement .  
 Person2:Try to catch this bouquet then . 

informal