You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Anthony Miller here. Can you help me to change my reservation to next week? Please.

ASSISTANT: Sure, wait a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: Sorry Miller, we don't found any reservation under your name.

USER: That's fine. Thank you.

ASSISTANT: Thank you for using our service, have a nice day.