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:       Charles , do you have any children ?  
 Person2:Yes .  
 Person1:        How many children do you have ?  
 Person2:I have two kids . A boy and a girl .  
 Person1:        What are their names ?  
 Person2:Jack and Stephanie .  
 Person1:        How old are they ?  
 Person2:Stephanie is 18 and Jack is 24 .  
 Person1:        Are they in school ?  
 Person2:Stephanie is . She goes to college in Washington and Jack works in Florida .  
 Person1:        What does Stephanie study ?  
 Person2:She studies English .  
 Person1:        Is she here now ?  
 Person2:No , she's at school . 

formal