Hello.
Hello. How may I help you at this moment?
I am Amanda Moore here. I would like to change my existing reservation, which is done recently. Can you please help me out?
Sure, I am glad to help you with that.
Thank you for considering my request.
Can you please wait a moment?
Sure, I will wait for your response.
I regret to inform you that, I have not found any active reservation with your name in our database to change  the details.
Not a problem, anyway thank you for the information.
My pleasure to help you. Thank you for consulting us.