You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I guide you?

USER: My name is Frank White.

ASSISTANT: Ok.

USER: I want to cancel my existing reservation due to my exams are postponed.

ASSISTANT: Ok, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: No reservation found as per our records to cancel.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.