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:       Are you busy with your work ?  
 Person2:Yes . What about you ?  
 Person1:        Yes , I'm very busy , too . Sometimes I work overtime .  
 Person2:Then your salary must be high .  
 Person1:        Just so so . But we can travel twice every year .  
 Person2:Is this time one of them ?  
 Person1:        Yes , we won't travel again until October .  
 Person2:Really ? We have only one chance every year . 

informal