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 fun here ? 
 Person2:Yes , of course . This is really a nice party with wonderful people and lovely wines . 
 Person1:        I ’ m glad you ’ re enjoying it . 
 Person2:Thank you for the invitation . 
 Person1:        It ’ s my pleasure . Would you like another glass of champagne ? 
 Person2:Yes , please . Thank you for everything . 

informal