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:       You have a nice apartment .  
 Person2:Thank you . My wife would be very happy to hear this .  
 Person1:        She must have done a lot of work on it .  
 Person2:You bet . 

informal