You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my existing reservation due to bad health issues. Can you help me in doing that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Sure, Dorothy Hernandez here.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say that no reservation found on your given name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us.