You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation, as my health is not good. Can you please help me out with it?

ASSISTANT: May I know your name?

USER: Thank you for the response, my name is Kenneth White.

ASSISTANT: Please wait.

USER: Ok, sure.

ASSISTANT: Sorry, no reservation found on  your name.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.