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:       ( Before Christmas Party ) Are you ready for the Christmas party tonight 
 Person2:Almost . I have to get dressed . It's a formal party and I have special party make up ! 
 Person1:        Use this lipstick and it will make your lips shine ! 
 Person2:Great ! Uh , remember that there's a gift exchange , too . We all have to bring a gift . 
 Person1:        I've already got mine . 
 Person2:( At the Party ) It's Christmas Eve ! Time to open presents ! 
 Person1:        Here ! Open mine first . 
 Person2:Wow ! It's just what I wanted ! 
 Person1:        Hey ! Why don't I have any presents ! 

informal