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:       What do you base our grades on ? 
 Person2:All of your coursework is important , including everything from attendance and homework to all of your test results for the semester . 
 Person1:        Does the final count the most ? 
 Person2:All of it is important ; please just do your best at all times . 
 Person1:        How do you total our scores ? 
 Person2:The final and mid-term are twenty percent each ; homework , attendance , and quizzes are the rest . 
 Person1:        What if we are out sick ? 
 Person2:Make sure you contact me as I only allow one unexcused absence . 
 Person1:        How can we know if we are doing OK during the year ? 
 Person2:Your grade will not be a surprise ; you will know what you need to work on . 

formal