Hello.
user
Hello. How may I help you?
assistant
Owning to an emergency I want to change my existing reservation. Can you please help me with this?
user
Sure, I am here to help you with that, can I know your good name to proceed further?
assistant
I am Karen Green.
user
 I am very sorry to inform you that there is no reservation found under your name in our database.
assistant
Ok, not an issue. Thank you for checking.
user
Thank you for choosing us.
assistant