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:       I hear that you have been promoted . Congratulations on your promotion !  
 Person2:Thank you , but I hate having to leave here and working abroad .  
 Person1:        When are you going ?  
 Person2:Sometime next month . 

informal