You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to change my existing reservation due to some health issue. Can you help me?

ASSISTANT: Sure, I will help you with that. May I know your name for further process?

USER: Thank you. I am Brenda Thompson.

ASSISTANT: Ok, please wait a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available under your name.

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

ASSISTANT: Thank you for reaching us, have a nice day.