Hello. Myself Dennis Hall.
user
Hello, how may I aid you today?
assistant
I want to change my existing reservation, can you help me?
user
Sure Dennis Hall, I am here to help you out. Please allow me a moment to check the reservation on your name.
assistant
Sure, I will wait for your response.
user
Sorry Dennis Hall, there is no reservation on your name in our database.
assistant
That's ok, thank you for the information.
user
Thank you for reaching us.
assistant