Hello, Kenneth Campbell here.
user
Hello, how may I help you?
assistant
I want to change my existing reservation. Will you please help me with that?
user
Yes, I am here to help you. Please give me a minute to check.
assistant
Sure.
user
Sorry, there is no reservation on your name.
assistant
Oh! It's ok, thank you for your response.
user
Thank you for contacting us, have a nice day.
assistant