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:       Room service.May I come in ?  
 Person2:Come in please .  
 Person1:        This is your breakfast.Can I put it here ?  
 Person2:Sure.How much is it ?  
 Person1:        That's $ 10 .  
 Person2:Well , here is the money .  
 Person1:        Sir , you don't have to pay right now.Just sign here and we will charge it to your account .  
 Person2:Fine . 

formal