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:       Do you have a family tradition at Christmas time ?  
 Person2:We have so Ay ! But my favorite happens at Christmas Eve .  
 Person1:        What is it ?  
 Person2:Well , all the brothers and sisters get together and fill the Christmas stockings for the litt 1e kids .  
 Person1:        That's it ? That's the tradition ?  
 Person2:Well , in fact it's fun for us to just be together that night and do this one thing .  
 Person1:        I guess the spirit of it is what really makes any tradition fun .  
 Person2:You should be there some Christmas Eve . 

formal