You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you?

USER: I would like to cancel my reservation because my sister is unwell. Can you please do that for me?

ASSISTANT: Sure, may I know your name please to check your reservation status?

USER: Sure, my name is Jeffrey Turner.

ASSISTANT: Jeffrey, your cancellation is successfully completed.

USER: Thank you very much.

ASSISTANT: Thank you for choosing us.