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:       What was the party like last night , Jean ?  
 Person2:Not bad at all , thanks . There were one or two interesting people there.Why couldn't you come ?  
 Person1:        Well , I couldn't get away from work early . And when . I got home I had a headache , so I had to go straight to bed . But I was over-tired , because I wasn't able to get to sleep for hours .  
 Person2:What a shame . Why didn't you take a sleeping pill ?  
 Person1:        I don't like them . I used to take them when I had to work overtime , you know .  
 Person2:How many did you use to take ?  
 Person1:        Three every night .  
 Person2:Good heavens . Why did you take so many ?  
 Person1:        Because I was under a terrible strain . The doctor saidthey weren't very strong . Anyway , I used to feel awful the next morning .  
 Person2:I'm sure you did .  
 Person1:        The doctor said I had to be careful .  
 Person2:He was quite right .  
 Person1:        So I stopped drinking coffee late at night instead . 

formal