Hello.
user
Hello, how may I aid you today?
assistant
I want to change my existing reservation. Could you help me with that?
user
Sure, may I know your name to check the reservation status?
assistant
Michael Hall.
user
Please wait for couple of minutes.
assistant
Ok.
user
Sorry, we couldn't find a reservation on your name.
assistant
That's ok, no  problem. Thank you.
user
Thank you for reaching us.
assistant