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:       Can I help you , ma'am .  
 Person2:Yes , will you keep our bags until 6 p . m . ?  
 Person1:        Are you all our guests ?  
 Person2:Yes , we checked out just now .  
 Person1:        Please fill in this form .  
 Person2:Is this all right ?  
 Person1:        So you are leaving this evening.We keep your bags until 6 p . m . Here's your tag .  
 Person2:Thanks a lot . 

formal