You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: I am Frank Anderson. I want to change my flight reservation as I am unwell. Can you please help me?

ASSISTANT: I am here to help you with changing your reservation.

USER: Sounds good.

ASSISTANT: Frank Anderson, there is no flight reservation is available for your journey.

USER: No problem. Anyway, thank you for checking.

ASSISTANT: Have a great day ahead.