Hello, I am Christopher Adams.
user
Hello, how can I assist you now?
assistant
I want to change my existing reservation, can you help me with that?
user
Sure, I will help you with that. May I know your good name? Please wait for a moment, while I check for the reservation.
assistant
OK.
user
Thanks for waiting, sorry to inform you there is no any reservation found on your name.
assistant
Ok, no issues. Thanks for your service.
user