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:       Am I allowed to check out at 14:00 ? 
 Person2:Certainly . 
 Person1:        Will there be any late charge ? 
 Person2:No.sir . If only you check out before 15:00 
 Person1:        Thank you . 

formal