You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Anna Wright. I am planning to change an existing reservation, due to health issue.

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Can you please help me out?

ASSISTANT: Anna, there is no reservation found under your name.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for contacting us.