You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Daniel King.

ASSISTANT: How can I help you?

USER: I would like to postpone my journey due to health issues. Can you please change my existing reservation?

ASSISTANT: Yes, give me a moment.

USER: Sure.

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

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for reaching us.