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:       Mary , there's one more thing that you must do for me before you leave .  
 Person2:What is it ?  
 Person1:        You have to take the math and English evaluation tests .  
 Person2:Why ?  
 Person1:        Because you're from a foreign country . The school needs to find out how good you are at both basic skills .  
 Person2:It's so that I can be put into the right math and English classes , right ?  
 Person1:        You are a smart girl !  
 Person2:This is going to take more time than I thought . 

informal