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:       I heard you were on a date last night ! So , how did it go ? I want all the juicy details !  
 Person2:Um ... well , actually , we had a fantastic time last night . He was ... amazing !  
 Person1:        Okay , now you really have to fill me in . What ’ s he like ?  
 Person2:He ’ s really good looking , he ’ s quite tall , around 6 ’ 1 ” , he ’ s in his early thirties , and he ’ s got the most beautiful dark brown eyes ...  
 Person1:        He sounds hot ! What does he do for a living ?  
 Person2:You know what , this is the best part . David is a junior investment banker at Fortune Bank , so he ’ s got a great career path ahead of him !  
 Person1:        Hold on a sec , his name is David ?  
 Person2:Yeah ?  
 Person1:        That ’ s my brother ! 

informal