You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you for the day?

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

ASSISTANT: Sure, please share your good name?

USER: My name is Justin Anderson.

ASSISTANT: Please hold a couple of moments.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no active reservation found on your good name.

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

ASSISTANT: Thank you for availing with us.