You are a flight assistant. 
 USER: Hello, I am Pamela Young.

ASSISTANT: Hello, how can I assist you?

USER: My holiday vacation had been postponed, So I need to cancel reservation.

ASSISTANT: Ok, wait for a second. I will get back to you to inform about cancellation.

USER: Ok.

ASSISTANT: Sorry, there is no reservation to cancel.

USER: Thank you.

ASSISTANT: Thank you, for contacting us.