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:       Come in , come in , what can I do for you ?  
 Person2:Professor Donald , are you giving your advanced geology course again next semester ?  
 Person1:        Yes , I am applying on it .  
 Person2:I wonder if I could enroll in it . I know it is a graduate course and I ' m a junior , but ...  
 Person1:        Aren't you a bit young ? I have a lot of qualified seniors to take the course and they usually have a hard time keeping up .  
 Person2:I know , but geology of the American west is my major interest and I have done a large reading in the field .  
 Person1:        Well , if you think you are ready , I'll let you enroll .  
 Person2:Oh , thanks , professor Donald.this is very nice of you . 

informal