You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your assistance?

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

ASSISTANT: Sure, may I know your name to check the reservation list?

USER: Sure, myself Mary Allen.

ASSISTANT: Please Stand by.

USER: Sure, take your time.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

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

ASSISTANT: Thank you for choosing us.

USER: Welcome.