You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Wilson.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for approaching us.