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 cancelling the reservation?

ASSISTANT: Sure, I can cancel your ticket.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, my name is Jessica Nelson.

ASSISTANT: Sorry Nelson, no reservation found by your name.

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

ASSISTANT: Thank you for approaching us.