A:Excuse me,are you Mr Black?
B:Yes.I am .Are you Mrs White...
A:Yes.How do you do?
B:How do you do?This is Jim,my brother.
C&D:Thank you
A:Excuse me,are you Mr Black?
B:Yes.I am .Are you Mrs White...
A:Yes.How do you do?
B:How do you do?This is Jim,my brother.
C&D:Thank you