You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Clark.

ASSISTANT: How can I help you?

USER: As my exam is postponed, I want to cancel my reservation. Can you help me?

ASSISTANT: Ok, please wait a while, I will check and inform you.

USER: Sure.

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

USER: No issue, thank you for checking.

ASSISTANT: Thank you for opting us.