You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: William Collins here. I want to cancel my recent reservation due to some problem. Can you please help me?

ASSISTANT: Sure William Collins, I am happy to help you with that. Please wait a moment to check your reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry William Collins, no reservation has found under your name to cancel.

USER: Ok, not a problem, thank you for your service.

ASSISTANT: Thank you for choosing us, have a good day.