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 was told my friend Joe was speaking ill of me . That's a real let-down .  
 Person2:I don't think Joe has done such a thing . Don't believe things in haste .  
 Person1:        Maybe I should go and ask him whether it's true . 

informal