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:       I think it is time to study . Our chemistry exam is coming .  
 Person2:Oh , I know . When is it ?  
 Person1:        December 1st .  
 Person2:What's on the test ?  
 Person1:        It seems to be from chapter six to chapter ten .  
 Person2:Well . I think I'm going to fail my chemistry exam .  
 Person1:        Why are you so pessimistic ?  
 Person2:I'm not being pessimistic . I'm being realistic . My chemistry is so bad .  
 Person1:        I believe you can pass the exam with good preparation . Don't lose your heart .  
 Person2:Thank you . That's very nice of you . 

informal