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:       Hello , is this Professor Clark ?  
 Person2:Yes , I am Professor Clark .  
 Person1:        Hello , Professor , this is Kalina , and I am in your literature class on Monday mornings .  
 Person2:Yes , how are you doing ?  
 Person1:        I was partying hard over the weekend , fell down the stairs , and need time to recuperate .  
 Person2:That sounds painful . Are you going to be OK ?  
 Person1:        I sprained my wrist , but the doctor says it will be fine .  
 Person2:How many days will you be out of school ?  
 Person1:        The doctor said I should be good enough to return next week .  
 Person2:I am glad you let me know that you will be missing class . Get well ! 

formal