Hello, Robert Hall here.
user
Hello. How can I help you?
assistant
Due to sudden change in my trip I have request you to change my reservation. Can you do this for me?
user
Sure. Can I know your name?
assistant
Sure, myself Robert Hall.
user
Ok. Sorry to inform you that there is no reservation found on your name.
assistant
Ok, thank you for the information.
user
Thank you for reaching us.
assistant