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:       Which pair of jeans do you like best ?  
 Person2:I really like the straight legs .  
 Person1:        But they aren't very fashionable . What about these ?  
 Person2:I don't like the way they sag down . I feel like I have plumber butt in them .  
 Person1:        That's the style ! You just wear boxers .  
 Person2:What if someone got it in their head to give them a tug ? What then ?  
 Person1:        You're so old fashioned ! Nobody is going to pull down your pants !  
 Person2:If you ask me , it's a walking invitation ! 

formal