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: Yes, I can help you with that.

USER: Thank you.

ASSISTANT: Can I know your name for checking your previous reservation?

USER: Sure, my name is Linda Green.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.