You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to health issue, I want to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: Kathleen Lewis here.

ASSISTANT: Thank you for providing your name. I did not find any reservation on your name to change.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for availing us.