You are a flight assistant. 
 USER: Hello, I am George Nelson.

ASSISTANT: Hello, how may I assist you?

USER: I want to make a few changes in my earlier reservation, due to postpone of my exams. Can you please help me with this?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: There is no reservation on your name in our database.

USER: Ok. Thank you for providing information.

ASSISTANT: Thank you.