You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I abet you?

USER: Please cancel my reservation on the name of Betty Robinson, which is booked earlier. As my manager did not approved my leave, on my journey day.

ASSISTANT: Sure, please wait a minute.

USER: Ok, I will.

ASSISTANT: Thank you for waiting, there is no reservation found under your name in our database.

USER: No problem at all. Thank you for instant service.

ASSISTANT: Thank you for availing us.