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:       What's going on ? 
 Person2:Not much . 
 Person1:        This Friday , I'm throwing a party . 
 Person2:Oh really ? I didn't know that . 
 Person1:        Are you serious ? 
 Person2:I haven't heard anything about it . 
 Person1:        Can you make it ? 
 Person2:What time does it start ? 
 Person1:        The party starts at 8 . 
 Person2:Yeah , I think I'll go . 
 Person1:        Am I going to see you there ? 
 Person2:You will . 

formal