You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide your at this moment?

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

ASSISTANT: Sure, may I know your name please?

USER: My name is Jessica Lopez.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Ok, sure.

ASSISTANT: There is no active reservation found with your name in our reservation list to cancel it.

USER: Ok, not a problem. Anyways, thanks for the information.

ASSISTANT: Thank you for reaching us.