You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I am glad to help you.

USER: Thanks for the response.

ASSISTANT: May I know your name please?

USER: My name is Kimberly Brown.

ASSISTANT: Please wait for a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there are no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.