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:       Hey Susan , what are you coming as this year ?  
 Person2:Coming as ?  
 Person1:        Yeah ... for Halloween ! We have a big office party tomorrow evening . There's a prize for best costume !  
 Person2:Um ... I have to confess , I haven't given it much thought . I'm from China and Halloween really isn't celebrated there .  
 Person1:        Really ! You don't have some kind of Chinese ghost festival ?  
 Person2:Oh ... Sure . We have an entire month ! In traditional Chinese culture , Ghost Month is a period when the door between this world and beyond opens up and ghosts come back to earth for a visit .  
 Person1:        Cool ! A whole month ! What do you do during that month ?  
 Person2:Well , people sometimes set off firecrackers , some people burn paper money as an offering and many people go to a temple to burn incense.Mainly though , you need to feed the ghosts because they're hungry .  
 Person1:        Feed them ?  
 Person2:Yeah ... we set up tables with food , fruit and drinks and offer that to the hungry ghosts .  
 Person1:        And then later everyone eats the food ?  
 Person2:Yes ! How did you guess that ?  
 Person1:        It makes sense , right ? Who else is going to eat it ?  
 Person2:Good Point !  
 Person1:        But no dressing up like ghosts , right ?  
 Person2:No ! So ... is Halloween essentially the same thing as ghost month ? 

informal