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:       I heard that James was fired because he got a keep back of 20 thousands dollars from a vender .  
 Person2:That ’ s open secret .  
 Person1:        But mine could be a lie for his job .  
 Person2:How did you know that ?  
 Person1:        A little bird whispered to me . Keep that to yourself . 

formal