You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

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

ASSISTANT: Ok, sure may I know your name?

USER: Sure, my name is Laura Lee.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.