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:       Excuse me .  
 Person2:Yes , sir . Can I help you ?  
 Person1:        Um , this steak , I asked for to be medium rare .  
 Person2:Medium rare , that ’ s right , sir . I remember your order .  
 Person1:        Well , I ’ m afraid it isn ’ t . It ’ s a bit too well done and rather tough . Would you mind changing ?  
 Person2:If it is not to your satisfaction , I ’ ll certainly bring you another . But I ’ m afraid you may have to wait for a few minutes .  
 Person1:        Yes , that ’ s all right . Thank you very much . 

informal