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

ASSISTANT: Hello. How may I support you today?

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'll help you in cancellation.

USER: Thank you.

ASSISTANT: Please wait a moment I'll check the reservation list.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, unfortunately there is no reservation found by this name.

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

ASSISTANT: Thank you for choosing us.

USER: Welcome.