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:       Good morning , sir . What can I do for you ?  
 Person2:I want to check in .  
 Person1:        Have you made a reservation ?  
 Person2:No , I want a double room . By the way , is there any discount for children ?  
 Person1:        Yes , children are half price .  
 Person2:Ok , please have me arrange one . 

formal