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:       Did you vote yesterday ? 
 Person2:I sure did ! 
 Person1:        What candidate did you vote for ? 
 Person2:I voted for Obama . 
 Person1:        I ’ m shocked he actually won . 
 Person2:I knew he would win . 
 Person1:        How ’ d you know ? 
 Person2:He was the best candidate this year . 
 Person1:        What about him being black ? 
 Person2:I guess America is finally maturing . 
 Person1:        I think you have a point . 

informal