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 in a hurry ! 
 Person1:        I am having an exam at nine , It's already eight 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 feel it . 
 Person2:Wow , Good for you.It sounds like a lot of work . I'm proud of you ! Is this the right building ? 
 Person1:        Yes , It's only eight forty . Thanks so much ! 
 Person2:You're welcome.Good luck , bye ! 
 Person1:        Have a nice day , bye ! 

informal