You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Barbara Edwards.

ASSISTANT: How may I amend you that?

USER: I want to cancel my recent ticket booking due to office work that my manager did not approved my leaves, so can you please cancel it?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can you please hold on for sometime? I will check and revert to you.

USER: Sure.

ASSISTANT: Thank you for your time, no reservation is existed to proceed further with cancellation.

USER: No problem. Thank you.

ASSISTANT: Thank you.