You are a flight assistant. 
 USER: Hello, I am Charles Brown.

ASSISTANT: Hello, how can I help you?

USER: I want to cancel my recent reservation due to my interview in New York  has postponed. Will you please help me for cancellation of my ticket?

ASSISTANT: Sure, I am happy to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your patience, we are sorry to inform you that there was no reservation found on your name.

USER: Ok, thanks for informing.

ASSISTANT: Thank you for availing us.