You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me in changing my existing reservation, as my health is not good?

ASSISTANT: Sure, I am here to help you to change it. Can I have your name please?

USER: Thank you for the response, my name is Laura Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry to say that, there was no reservation found on your name to change it.

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

ASSISTANT: Thank you for availing us.