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 think your speech was excellent . 
 Person2:Was it ? 
 Person1:        Sure it was . 
 Person2:Thank you.It was really a challenge to speak before such a large audience , you know . 
 Person1:        But you did it and did it well ! 

informal