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:       I was wondering how you are going to calculate our final grades .  
 Person2:Grades are based on many things  
 Person1:        What counts the most ?  
 Person2:Actually I look at all of it and let's not forget class participation .  
 Person1:        Do you grade on a curve or use percentages ?  
 Person2:Homework , attendance , and quizzes are sixty percent ; the mid-term and final are worth twenty percent each .  
 Person1:        What if we miss something ?  
 Person2:I will allow one unexcused absence ; after that you need to contact me ahead of time .  
 Person1:        Will you tell us if we are failing during the year ?  
 Person2:You will be able to track your progress during the year . 

formal