Hello, I'am Raymond Allen.
user
Hello, how can I best serve you today?
assistant
I want to change my existing reservation, can you help me in that?
user
Sure, I will help you. Please wait for a moment, I will check and get back to you.
assistant
OK.
user
Thanks for waiting, sorry to inform that there is no any reservation on your name.
assistant
Thank you for your information.
user
Thanks for connecting with us.
assistant