You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I made a reservation to attend a meeting, but owing an emergency I want to change my existing reservation. Can you please make a new reservation?

ASSISTANT: Ok, May I know your name?

USER: My name is Anthony Mitchell.

ASSISTANT: Unfortunately, There is no reservation with your request.

USER: No problem.

ASSISTANT: Ok, Thank you.

USER: Thank you for the information.