You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Kenneth Hill.

ASSISTANT: How may I assist you now?

USER: Can you please change my reservation, due to an emergency?

ASSISTANT: Kenneth Hill, please allow me to check with your previous booking.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no flight available for your journey.

USER: Ok, no issue. Thank you.

ASSISTANT: Have a nice day.