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:       Do you want to go to the beach tonight ?  
 Person2:Sure , which beach are we going to ?  
 Person1:        I wanted to go to Malibu beach .  
 Person2:I like Santa Monica .  
 Person1:        The water there looks so dirty .  
 Person2:I just like the pier they have at Santa Monica .  
 Person1:        I like the pier too , because it's beautiful at night .  
 Person2:Is Malibu beach nice ?  
 Person1:        It's a lot nicer , and I really like it better .  
 Person2:So you want to go to Malibu ?  
 Person1:        If that's okay with you .  
 Person2:Sure , let's go to Malibu . 

informal