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:       Hello , Doctor .  
 Person2:Well , What seems to be the trouble , Mr . Williams ?  
 Person1:        It's nothing serious actually , doctor . It ’ s ... Well , I get tired very easily recently , and I often doze off during meetings , office hours and sometimes even while I'm dining .  
 Person2:How long has this been going on ?  
 Person1:        About two months . I didn't pay much attention to it in the beginning , but you see , I got fired this morning . I dozed off while we were having an important meeting , right in front of the boss . I was very embarrassed .  
 Person2:How was your appetite ?  
 Person1:        Pretty good , I'd say .  
 Person2:You haven't lost any weight , have you ?  
 Person1:        No , doctor . I've actually put on two pounds .  
 Person2:Unbutton your shirt , please .  
 Person1:        Well , doctor ?  
 Person2:You'll have to have some laboratory examinations to know for sure .  
 Person1:        What examinations ?  
 Person2:A blood test and during test . You can come back next week , say 4 pm to see the results . 

formal