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:       Have you ever witnessed any crimes or accidents ? 
 Person2:I don't quite remember . Why did you ask that ? 
 Person1:        I was taking a walk in the park early this morning when suddenly I heard someone calling " help " . I rushed over and saw a man beating a woman . 
 Person2:Oh , my . What did you do ? 
 Person1:        I guess I was stunned for a moment , then I quickly ran away to get help . 
 Person2:Did you call the police ? 
 Person1:        Yes . Fortunately , I had my cell with me this morning . I called the police as I was running to get people to come to help . 

informal