You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jonathan Young.

ASSISTANT: How may I guide you Jonathan?

USER: Recently I met with an accident, so I can't take flight on 06/12. Can you please help me in changing my reservation?

ASSISTANT: That's so sad to hear. Sure, I can help you with that. I'm sorry to inform you that there are no reservations with your name.

USER: That's fine. Thank you for your time.

ASSISTANT: Thank you Jonathan, have a great day.