You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I support you today?

USER: Actually my Final Examination is postponed, so that I want to change my existing reservation. Can you help me?

ASSISTANT: May I know your good name please?

USER: Yes, I am Cynthia Walker.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: Ok, not an problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.