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:       The tranquility of the night , the chirping of some insects , everything is so natural !  
 Person2:I felt as if I had been in a different world .  
 Person1:        And I was overwhelmed by this scene , too . 

informal