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:       Jenny , are you having a good time ?  
 Person2:Yes , of course . This is a really wonderful party with interesting people and great food .  
 Person1:        I ’ m glad you are enjoying yourself .  
 Person2:Thank you for the invitation .  
 Person1:        It ’ s my pleasure . Can I get you another glass of champagne ?  
 Person2:Yes , I ’ d love another glass . You ’ re a wonderful host . Thank you for everything .  
 Person1:        It ’ s my pleasure having you here . 

informal