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 want to reserve a VIP room at 7:00 this evening .  
 Person2:OK , sir . How many people are there in your party ?  
 Person1:        8 . Is your VIP room big enough for 8 persons ?  
 Person2:Of course . 

informal