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 . Emory ? I ’ d appreciate it if you would look over these letters before you leave today .  
 Person2:I ’ d be glad to . Just leave them on my desk . I didn ’ t expect you to finish so soon .  
 Person1:        Thank you , sir . I ’ ll leave them here . If there are no problems , I ’ ll mail them out this afternoon .  
 Person2:Great . Good work . 

informal