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:       I guess you should know that you need to be hospitalized . 
 Person2:Of course I know . 
 Person1:        Now you can go to the in-patient department to go through the admission procedures . 
 Person2:OK . I'll go right now . By the way , do you think I ’ ll have to stay in the hospital for long ? 
 Person1:        It's hard to say . It depends on your recovery condition . But you need to stay for at least one day for observation . 
 Person2:Thank you , Doctor . I will go now . Bye-bye . 
 Person1:        Bye ! 

formal