Hi.
user
Hello. How may I help you now?
assistant
I want to change an existing  reservation due to sudden change in my trip. Can you help me?
user
Sure, I will help you. May I know your good name to check your reservation status?
assistant
Thank you. Edward Walker.
user
Ok, please wait for a while.
assistant
Ok.
user
Sorry to say that, we have not found any active reservation on your name in our records.
assistant
No issue, Thank you for the information.
user
Thank you for choosing us.
assistant