Hello.
user
Hello. How can I  help you?
assistant
I need to change my boarding point of my existing reservation as I need to go to other place first and I will start from there. Can you help me out with this?
user
Sure, may I know your name please?
assistant
My name is Raymond Miller.
user
I am sorry no reservation found on your name.
assistant
No problem, thanks for your information.
user
Thank you for choosing us.
assistant