Hello.
user
Hello. How may I help you?
assistant
Due to change in my plans to visit Dallas, I would like to change my existing reservation. Can you help me with this?
user
May I know your name please to check your reservation status?
assistant
My name is Charles Thompson.
user
Charles, no reservation has been found on your name.
assistant
Ok, not an issue. May be something went wrong while booking the ticket. Thank you for providing information.
user
Thank you for choosing us.
assistant