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:       How do you do ? I ’ m Parker .  
 Person2:How do you do ? Mr . Barker .  
 Person1:        Parker .  
 Person2:Oh , Parker with a P ?  
 Person1:        Yes , with a P .  
 Person2:Er ... I ’ m Barker .  
 Person1:        Barker ? With a B . Of course .  
 Person2:Yes , with a B .  
 Person1:        Won ’ t you come in , Mr . Barker ?  
 Person2:Thank you , Mr . Parker . 

informal