You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I need to modify my reservation as I am not able to make a trip due to some health issue. Can you help me with that?

ASSISTANT: Sure, I am glad to help you out with that.

USER: Thank you for considering my request.

ASSISTANT: May I know your name please?

USER: Sure, my name is Eric Brown.

ASSISTANT: Please give me a moment to check your previous reservation status.

USER: Sure, have your time.

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

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.