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:       Hi , Ellen ! How is it going ? 
 Person2:Can ’ t be better ! Bob , aren ’ t you glad the semester is over ? 
 Person1:        Yep ! Are you going to the rock concert Friday night ? 
 Person2:I didn ’ t think much of it . Are you ? 
 Person1:        Sure . Would you like go with me ? 
 Person2:Sounds like fun . 
 Person1:        You ’ ll have to buy your own ticket though . 
 Person2:Are you broke again ? Let me treat you . 
 Person1:        Wow ! When did you come into so much cash ? 
 Person2:You know , I am a waitress at the student center . Anyway now those final exams are almost over . I ’ d love a night out . 

informal