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:       Is Water Shrinking Festival official ? 
 Person2:No , most of the traditional festivals of the minority nationalities are not official . 
 Person1:        Don't you think these festivals are more interesting ! 
 Person2:What an idea ! 

informal