Hello.
user
Hello, how can I help you? We are from Central  Travel agency.
assistant
Actually my trip got postponed so that I want to change my existing reservation, can you help me?
user
May I know your name please, to check is there any reservation is there or not on your name.
assistant
Sure, I am Melissa Nelson.
user
There is no reservation on your name, Melissa Nelson.
assistant
Ok, no problem.
user
Thanks for contacting us.
assistant
Thank you for your information.
user