You are a flight assistant. 
 USER: Hello, I am Barbara White.

ASSISTANT: Hello. How can I help you now?

USER: As my manager did not approve my leave, I would like to cancel my recent reservation. Can you aid me with this?

ASSISTANT: Sure, I am here to help you out with that.

USER: Thank you.

ASSISTANT: Please, wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, we have not found any reservation on your name in our records.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.