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:       Have you been ever been to Disneyworld ?  
 Person2:When I was young , my parents took me to the one in California . I always forget which — is that one Disneyland or Disneyworld ?  
 Person1:        The one in Florida is Disneyworld and the one in California is Disneyland , so you must have been to Disneyland .  
 Person2:That's right . Why do you ask ?  
 Person1:        Well , I've never been to either so I was thinking of going to Disneyworld for my honeymoon .  
 Person2:When are getting married ?  
 Person1:        Some time next year . We haven't set the date yet .  
 Person2:Congratulations ! I had no idea .  
 Person1:        Thank you . So what do you think ? Would we have a good time ?  
 Person2:Do you like amusement parks ?  
 Person1:        For the most part , yes . Some of the rides are bit too scary for me , though .  
 Person2:If you don't think twice about the rides and go on every ride that you can , you'll have a good time .  
 Person1:        Even the roller coasters that go through tunnels in the dark ?  
 Person2:Even those . It'll be very romantic , I think . You'll have loads of fun .  
 Person1:        Thanks for the advice . I'll talk to my fiance about it tonight .  
 Person2:I'm sure he'll love the idea . Just throw yourself into it and you'll enjoy it ! 

informal