You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist 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 please?

USER: Sure, my name is Jason Anderson.

ASSISTANT: Sorry, there is no reservation with your name to change further.

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

ASSISTANT: Thank you.