You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Myself Dennis Lopez.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no active reservation on your name in our portal to change.

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

ASSISTANT: Thank you for choosing us.