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 hear your daughter graduated from high school as the valedictorian . 
 Person2:Thank you . 
 Person1:        Where is she going to college ? 
 Person2:She has been admitted to Yale with a scholarship . 
 Person1:        Really ? That's the icing on the cake . Congratulation again ! 
 Person2:Thank you . 

informal