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 am Liu Yi , from China XYZ Company . I ’ d like to see Mr . Thomas , please .  
 Person2:Do you have an appointment , Mr . Liu ?  
 Person1:        No , I am afraid not . I just arrive in town today .  
 Person2:Mr . Thomas is quite busy , I ’ m afraid he won ’ t be able to see you today .  
 Person1:        Would you please ask when he will be free ?  
 Person2:Have a seat please while I call . 

formal