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:       Good morning Mike !  
 Person2:Morning Sally ! What's up ? you seem many hurry !  
 Person1:        I am having an exam at 9 o'clock , It's already 8 thirty .  
 Person2:Don't worry , I'll drive you .  
 Person1:        Thank you very much !  
 Person2:How are your cases coming along ?  
 Person1:        Very well , thanks , I will probably finish next week , but this is still a lot of work , I have been worked on in for six months , and i ' m so closed to end . I can fill in .  
 Person2:Wow , Good for you . It sounds like a lot of work . I'm proud of you ! Is this the red of building ?  
 Person1:        Yes , It's only 8 forty . Thanks so much !  
 Person2:You're welcome . Good luck , bye !  
 Person1:        Have a nice day , bye ! 

informal