Hello.
user
Hello, how may I help you?
assistant
I need to change my existing reservation.Can you help me in changing reservation?
user
Sure, I am here to help you. To change an existing reservation, I need to know your name?
assistant
Dorothy Johnson is my name.
user
OK, please wait for a moment.
assistant
OK.
user
Thanks for waiting. Sorry there are no reservation found on your name.
assistant
OK, thanks.
user
Thank you, have a nice day.
assistant