Hi.
user
Hello. How can I help you?
assistant
I'm Alexander Brown here, I want to change my existing reservation. Can you please help me?
user
Alexander Brown, I am here to help you. Please wait a moment.
assistant
Sure.
user
Sorry, there is no reservation found with your name.
assistant
Ok, that's fine. Thank you for your kind information.
user
Thank you and have a great day.
assistant