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:       Hey Mike . What are you doing ?  
 Person2:Nothing much . What are you up to ?  
 Person1:        I was just concerned about Sam . He hasn't been himself lately .  
 Person2:He took the civil service exam and failed .  
 Person1:        That sucks . He must feel depressed .  
 Person2:Yeah . He's been sitting in his room everyday for the last 4 days .  
 Person1:        Why don't we take him out ? We can try to take his mind off of it . In the least show him that we're there for him .  
 Person2:That's a great idea . Why don't you call him . I already talked to him a couple of times and it might be good for him to hear from somebody else .  
 Person1:        Ok . I'll call you back after I'm done .  
 Person2:Sounds good . 

informal