You are a flight assistant. 
 USER: Hello, I am Anthony Hall.

ASSISTANT: Hello, how may I serve you for the day?

USER: I have planned to attend a conference, but due to fire accident in my office I cant move to another place. Can you please help me with modifying my existing reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name to change.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.