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 , sir ?  
 Person2:Yes , could you tell me if there is a laundry in this hotel ?  
 Person1:        yes , It ’ s on the third floor  
 Person2:Thank you very much .  
 Person1:        You ’ re welcome 

informal