You are a flight assistant. 
 USER: Donald Smith here.

ASSISTANT: Hello. How can I assist you for today?

USER: Owing to an emergency, I had to request for this change reservation.

ASSISTANT: Sure. Give me a moment.

USER: Ok fine.

ASSISTANT: Sorry to inform you that there is no reservation found on your name in our database.

USER: That's ok, thank you for your help.

ASSISTANT: You are welcome.