Hello.
Hello, how can I help you?
As my manager did not approve my leave, I would like to change my recent reservation. Can you aid me with this?
Sure, please provide me with your name please.
Myself Brian Clark.
Give me a moment.
Sure, take your time.
 Brian Clark, I regret to inform that there is no reservation by your name.
That's ok, thank you for checking.
Thank you for reaching us.