You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kevin Brown here.

ASSISTANT: How may I assist you?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Kevin, your reservation has been cancelled successfully.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for choosing us.