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:       Hello Bill , what's new ?  
 Person2:Bob and Mary are back together .  
 Person1:        I'm glad to hear it .  
 Person2:Me too , they're such a nice couple . 

informal