You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, please share your name?

USER: I'm Anthony Smith.

ASSISTANT: There is no reservation on your name, Anthony Smith.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thanks for reaching us.