You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that I can do for you?

USER: I would like to cancel my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I can help you. Can I know your name please?

USER: Thank you, my name is Kathleen Williams.

ASSISTANT: Be on hold for a moment to check it.

USER: Ok.

ASSISTANT: Sorry to say that there is no reservation found for the user name in our back end to cancel your ticket booking.

USER: Ok, thank you for the information.

ASSISTANT: You are most welcome and have a nice day.