You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: William King here. I want to cancel my reservation as I am busy and can not go on the trip, can you please help me?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Thank you. Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no reservation found with your name.

USER: No problem, thank you anyway.

ASSISTANT: Thank you for reaching us.