You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my existing reservation due to some health issue. Can you help me in doing that?

ASSISTANT: Sure, may I know your name please?

USER: My name is Brenda Edwards.

ASSISTANT: Please wait while I fetch your current reservation with us.

USER: Sure.

ASSISTANT: We don't have any reservation on your name in our system to make changes.

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

ASSISTANT: Thank you.