Hi, I am Samantha Gonzalez.
user
Hello, how may I render you at this moment?
assistant
Owing an emergence, I want to change my existing reservation. Can you please help me with it?
user
Sure, I am here to help you. Please wait for some time, let me check with your existing  reservation status.
assistant
Ok.
user
There is no existing reservation found on your name in our data base.
assistant
No problem, thanks for the information.
user
Thank you for approaching us.
assistant