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:       Let me tell you what happened to my homework . 
 Person2:OK , go ahead--what is the excuse THIS time ? 
 Person1:        Actually , I did it , but then it got lost . 
 Person2:Could you have gotten it done at another time ? 
 Person1:        Yes , I could . 
 Person2:You have never missed an assignment before--when will you be making this one up ? 
 Person1:        I'll make it up early next week . 
 Person2:That would work , but don't let it happen again . 
 Person1:        I'll try . 
 Person2:That will solve it then . Let's work hard to not let it happen again . 

formal