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:       Are you going to Helen ’ s birthday party on Friday evening ?  
 Person2:I wouldn ’ t miss it for the world ! It ’ s sure to be fun . She ’ s invited a lot of people . Do you think everyone will be able to get into her house ?  
 Person1:        If everyone turned up , it would be a squeeze , but a few people said that they couldn ’ t go , so I think it should be ok ?  
 Person2:Are you taking anything ?  
 Person1:        I ’ Ve got her a birthday present and I ’ ll take a bottle fo wine too .  
 Person2:That ’ s a good idea . She told me that she had bought plenty of food and snacks . I think it ’ s going to be a noisy party . I hope her neighbours don ’ t mind too much .  
 Person1:        Helen gets on very well with her neighbours . I wouldn ’ t be surprised if they went to the party too .  
 Person2:I ’ m ready looking forward to it . This party is going to be a blast !  
 Person1:        Well , don ’ t be late . I ’ ll see you on Friday at Helen ’ s . 

informal