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:       Hey , Gary , great to see you again . Please have a seat . So tell me , what seems to be the problem ? 
 Person2:Thanks , doc . I ’ Ve got a really bad toothache ! I can ’ t eat anything , and look , my face is all swollen . I think it might be my wisdom tooth . 
 Person1:        Well , let ’ s have a look . Open wide . Hmm ... this doesn ’ t look good . Well , it looks like you have a cavity and your crown is loose . We ’ ll need to put in a filling before it gets any worse , and the crown probably needs to be refitted . I ’ m going to order some x-rays . 
 Person2:Is it gonna hurt ? 
 Person1:        No , not at all ! Just lay back and relax . 
 Person2:Ok , spit . 

informal