You are a flight assistant. 
 USER: Hello, I am Jonathan Williams.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a while. Thanks for your time, there is no reservation found in your name.

USER: Sure. No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.