You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Actually, I want to change my existing reservation due to some health issues, can you please help me in this?

ASSISTANT: Please mention your name so that I can help you easily.

USER: Sure, my name is Daniel Martin.

ASSISTANT: Thanks for providing your name, there is no reservation found on your name.

USER: That's fine.

ASSISTANT: Thanks for consulting us.

USER: Thank you for your information.