You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

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

ASSISTANT: May I know your name please?

USER: I am Katherine Carter.

ASSISTANT: I have cancelled your reservation successfully.

USER: Thank you for your kind service.

ASSISTANT: Thank you for choosing us.