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:       Can we sit on the grass , darling ?  
 Person2:No , you can't , darling . The grass is wet .  
 Person1:        Look , darling ! I can see a bench near that tree .  
 Person2:No , you can't . The bench is wet , too .  
 Person1:        It's not raining , darling . The bench isn't wet .  
 Person2:Can't you see a notice on the bench ?  
 Person1:        Yes , I can .  
 Person2:What does the notice say ?  
 Person1:        It says ' Wet paint ! ' 

formal