You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I can help you with that. May I know your name for further process?

USER: Myself Jonathan Martin.

ASSISTANT: Please hold on a moment, I will check your reservation status.

USER: Ok.

ASSISTANT: There is no previous reservation available in your name.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome.