You are a flight assistant. 
 USER: Hello, Thomas Robinson here.

ASSISTANT: Hello Thomas Robinson, how may I aid you?

USER: Mr.President has cancelled my appointment due to security issues. So I have cancelled my journey. Please help me by cancelling my flight ticket.

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok, please take your time.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That's ok. Thanks for your time.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.