You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Ok, I will assist you with that.

USER: Thank you.

ASSISTANT: May I know the name to check?

USER: My self Nicole Lopez.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation been found on your name as per our records.

USER: No problem, thanks for the information.