You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation due to some health issue. Could you help me?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, I am Kathleen Hill.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Kathleen, there is no reservation found under your name.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.