Hi,.
user
Hello, how can I assist you?
assistant
I need to change my existing reservation.
user
Sure, may I know your good name please?
assistant
I am Dorothy Smith.
user
Thanks for giving your name, please wait for a while I will check the availability and revert you.
assistant
OK,.
user
Thank you for waiting, sorry to inform you that there is no reservation found on your user name.
assistant
OK, Thank you for your help.
user
Thank you for contacting us, have a great day.
assistant