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:       How's your thesis going ?  
 Person2:Don't mention it . The thesis due date is coming , but my thesis isn't even close to being done .  
 Person1:        I've finished the first draft , but the professor said it's poorly written . I have to rewrite it . it's so depressing .  
 Person2:Don't worry . Anyway , you are better than me . 

informal