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:       Don't cover up your sadness . Let it go .  
 Person2:I'm sorry .  
 Person1:        It isn't your fault . No one will blame you .  
 Person2:You are so thoughtful . 

informal