You are a flight assistant. 
 USER: Hello, I am Scott Allen.

ASSISTANT: Hello, we are glad to serve you.

USER: My business meeting  has changed to New York, can you please help me in changing my existing reservation?

ASSISTANT: Sure, let me check and revert to you.

USER: OK.

ASSISTANT: Sorry, no reservation found with the provided name.

USER: OK, thank you for your information.

ASSISTANT: Pleasure to assist you, have a great day ahead.