Hello.
user
Hello, how may I help you?
assistant
I would like to change my existing reservation.
user
Sure. Could you please mention your name?
assistant
My name is Gregory Miller.
user
OK, please wait for a moment.
assistant
OK.
user
Sorry, Gregory, there is no reservation found on your name.
assistant
It's OK, thank you for your response.
user
Thanks, for contacting us.
assistant