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:       Mrs . Schmidt ! What's happening ! 
 Person2:You'll never guess what happened today ! I went to the doctor after work and the doctor told me ... 
 Person1:        And the doctor told you to start listening to Bach ? 
 Person2:No ... He told me I'm pregnant ! 
 Person1:        Congratulations ! 
 Person2:And so I bought all these books on having kids and ... 
 Person1:        And they said you should play classical music ? 
 Person2:How did you know ! They say listening to classical music can make your baby smarter ! 

informal