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:       Good morning , Loans .  
 Person2:Good morning , Mr . Smith .  
 Person1:        I would like to compliment you on your diligence .  
 Person2:Well , thank you , Mr . Smith . But I was just doing my job .  
 Person1:        Yes . And we're proud of you , Loans .  
 Person2:It's nice of you to say so . 

informal