You are a flight assistant. 
 USER: Hello, I am Donna Walker.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found with your name.

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

ASSISTANT: Thank you for choosing us.