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:       Let's do something different today .  
 Person2:Like how ?  
 Person1:        I would like you to give me a different hair style .  
 Person2:What did you have in mind ?  
 Person1:        Give me a short haircut .  
 Person2:Do you know how short you want your hair to be ?  
 Person1:        I want you to cut it to a few inches long .  
 Person2:That's pretty short . Are you sure about this ?  
 Person1:        I've had this idea for some time now .  
 Person2:I'm going to do it , but you have to be sure you really want me to .  
 Person1:        This is what I want .  
 Person2:Fine then . Let's get started . 

formal