You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Robert Brown.

ASSISTANT: Ok.

USER: As my semester exams has been postponed, I need  to cancel my reservation. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: No problem. Thank you.

ASSISTANT: Thank you for opting us.