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 , Wen ! Welcome to D . C . ! Glad you came out to visit !  
 Person2:Thanks for inviting me . Actually , I've never been anywhere with so many black people before . It's different .  
 Person1:        Howard is eighty percent black . But there are whites , and even Asians here . Thankfully , it's also coed .  
 Person2:Great ! Is your , too ?  
 Person1:        Sorry , nope . But the Alpha Phi Alpha's are throwing a party tonight .  
 Person2:That's a black fraternity , right ? So we should see some dancing ! 

informal