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:       Cheers ! To our first night in our new apartment .  
 Person2:It's so quiet . I'm not really used to it .  
 Person1:        All you hear is the crickets and the breeze .  
 Person2:It's a little eerie . I'm sure the silence will begin to grow on me .  
 Person1:        Well , I think it's fabulous . And the neighbors don't even seem to exist .  
 Person2:That is a relief . It's a good thing we moved . 

informal