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:       Matthew ? Hi !  
 Person2:Steve ! Haven't seen you in ages ! How long's it been ?  
 Person1:        it's got to be almost a year now .  
 Person2:how have you been ?  
 Person1:        I'm pretty good . I've been looking for a place to live recently . My lease runs out next month and I don't want to renew it .  
 Person2:yeah , I remember the neighborhood . Have you found a place yet ?  
 Person1:        not yet . I am still looking through the classifieds . Wish me luck .  
 Person2:well , maybe I can help . Remember my neighbor ?  
 Person1:        Mrs . Thou ?  
 Person2:yes , her daughter's having a baby , so she's moving in with her to help out . I think if you are interested , you can come over and have a look .  
 Person1:        great . It's a lovely neighborhood . And it would be nice to be neighbors again . It would be just like the old days !  
 Person2:I'll ask Mrs . Thou when she's available to show the apartment and let you know . Has your number changed ? 

formal