You are a flight assistant. 
 USER: Hello, I am Karen Miller.

ASSISTANT: Hello, How best can I assist you at this moment?

USER: As my manager did not approved my leave, can you help me to cancel my recent reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: We regret that, there is no active reservation found on your name to cancel it.

USER: No problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.