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:       It's almost Christmas . What are you doing this weekend ?  
 Person2:Nothing special , just working . Why do you ask ?  
 Person1:        Well , I still haven't finished my Christmas shopping . Do you want to go shopping with me this weekend ?  
 Person2:I'd like to , but I'm not sure if I can . Work has been really busy lately . Why don't we go on Friday instead ?  
 Person1:        Friday's not good . I think the stores will be very crowded and I have to work .  
 Person2:OK , then let's try to go this weekend . I should know if I can go by Friday . Is it OK if I call you then ?  
 Person1:        Yeah , that's fine .  
 Person2:What's your number ?  
 Person1:        233-331-8828 . Let me give you my email address too . It's Tom861@gmail.com  
 Person2:OK , I'll talk to you soon .  
 Person1:        OK . 

informal