You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I have to cancel my flight ticket that I unable to travel to meet my sister that she came to meet me, can you help me in that one?

ASSISTANT: Sure, I will help you. Just give a moment.

USER: Thank you.

ASSISTANT: May I know your name please.

USER: Sure, my name is Joshua Williams.

ASSISTANT: I found your reservation on your name, shall I proceed to cancel the reservation?

USER: Ok, please cancel it.

ASSISTANT: Your reservation is cancelled successfully.

USER: Thank you for your appreciable service.

ASSISTANT: Thank you for opting us.