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:       We should know by next month whom to hire . If your application is successful , we'll notify you by mail .  
 Person2:How long would I wait ?  
 Person1:        We'll give you our decision in 7 days .  
 Person2:Thank you . I hope to hear from you as soon as possible .  
 Person1:        Please send the next candidate in on your way out .  
 Person2:OK , good-bye . 

formal