You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Virginia Brown.

ASSISTANT: How may I aid you?

USER: I am planning to book a change an existing reservation, due to health issue. Can you please change my reservation?

ASSISTANT: Sure, please give me a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.