Situation :
You tell your friend that next month Barrack Obama will visit your school, but your friend doubt it.Dewi : Hi, good morning.
Andis : Hi, good morning too.
Dewi : How are you?
Andis : I am fine, and you?
Dewi : Fine too. I have information for you, it make's me shocking.
Andis : Could you explain to me about this information?
Dewi : Yes, of course. Mr. Obama, the President of USA will come to our school next month.
Andis : Really? Are you sure? Are you kidding me?
Dewi : Yes, of course. I am serious.
Andis : It's impossible, i think. Are you sure that information it's true?
Dewi : I'm very certain.
Andis : Where do you get the information?
Dewi : Yesterday, i saw announcement about Mr. Obama will come to our school next month in teacher office.
Andis : I don't think so Mr. Obama really come to our school next month. I've doubt about it.
Dewi : Whatever, if you don't believe me, please check it in teacher office.
Andis : OK, i will.
Dialogue Expressing Uncertainty