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:       Look , the aliens are sending a message to Mulder . This rocks !  
 Person2:Whoops . That's my pager . I had to get it for work .  
 Person1:        You have a pager ? ! That's a little high-tech for you , Stu . Are you sure you know how to use it ?  
 Person2:Well , I know how to turn it off !  
 Person1:        No , you don't ! It's still beeping ! Come on , hand it over and I'll turn it off for you . 

formal