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:       I have some good news for you .  
 Person2:What's that ?  
 Person1:        Jenny is getting married .  
 Person2:Great ! Who's the bridegroom ?  
 Person1:        Tom , that lucky guy .  
 Person2:The guy always hands the girls in a line . When did he propose ?  
 Person1:        Last week , It said that he fell in love with Jenny at Mrs.Whit ' s party last Monday as soon as he saw her .  
 Person2:My gosh ! How romantic ! When's the big day ?  
 Person1:        July 4 , the National Holiday .  
 Person2:Will it be a church wedding or a civil ceremony ?  
 Person1:        Jenny plans to hold it in church .  
 Person2:Who is the best man ?  
 Person1:        Guess !  
 Person2:Nobody is OK , but you !  
 Person1:        You know , Tom is my best friend and he asked me to be his best man .  
 Person2:Did you promise him ?  
 Person1:        Yes , I did . 

informal