You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for this moment?

USER: My name is William Walker. Can you help me in cancelling my existing reservation?

ASSISTANT: Glad to meet you, Walker. Sure, I will help you with this. Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Walker, there is no reservation found as per your name to cancel your reservation.

USER: That's ok. Thank you for your time.

ASSISTANT: You are welcome.