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:       Mr . Crane ’ s office . Sandy speaking . May I help you ?  
 Person2:Hi , Sandy . It ’ s Walter Knight . I need to book some time with Mr . Crane .  
 Person1:        Certainly , Mr . Knight . When would you like to meet with him ?  
 Person2:Can you see what his schedule is like on Wednesday ? 

formal