You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My holiday vacation has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, may I know your name?

USER: Sure, I'm Rebecca Williams.

ASSISTANT: Rebecca, there is no previous reservation on your details.

USER: Ok, It's fine. Thank you for your information.

ASSISTANT: Is there any other trip?

USER: No.

ASSISTANT: Ok, thank you for approaching us.

USER: Welcome.