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 . Blake ? Mr . Foster ’ s on the phone . He ’ d like to know if you can send over those training manuals ?  
 Person2:Oh , tell him I ’ ll leave them at his office tomorrow afternoon .  
 Person1:        He was hoping that you could drop them off this afternoon .  
 Person2:I ’ m afraid that I can ’ t do that . They ’ re at the printer ’ s being copied . They ’ ll be back tomorrow before 1 o ’ clock . 

formal