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:       Kathy ! How are you ? It's been ages ! What are you doing these days ?  
 Person2:I just opened my own restaurant . I'm also head chef .  
 Person1:        You're kidding ! You've always hated cooking !  
 Person2:Well , I used to hate cooking , but now I love it .  
 Person1:        When did you change your mind ?  
 Person2:After I tried French food . Before that , I used to cook really boring things for my family .  
 Person1:        I still can't believe it ! So , did you go to cooking school or something ?  
 Person2:Yeah . I went to California to study .  
 Person1:        Really ? How long did you stay there ?  
 Person2:I was there between 88 and 90 .  
 Person1:        And what did you do after that ?  
 Person2:Then I came back here . I worked for about three years to get some experience . 

informal