Hi.
Hello.
I am Jacob Williams.
How may I help you?
I would like to change my existing reservation, can you please help me in changing?
Sure, I am here to help you.
Sure. Thank you.
Please be on hold, let you know the current status.
Ok.
Thank you for your time,  we do not found any reservation in your name.
Ok, not an issue thank you for your information.
Thank you for reaching us.