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:       I am sorry to say this , but I seem to have lost the key to the safe .  
 Person2:Where do you think you lost it ? Outside the hotel ?  
 Person1:        Yes , I believe so.How should I compensate for this ?  
 Person2:I'm afraid , ma'am , you have to pay U . S . $ 100 since you lost the key .  
 Person1:        What ! One hundred U . S . dollars.Is it covered by the insurance ?  
 Person2:I'm afraid no.It is not covered by this insurance . 

informal