You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT:  Let me know your name to check your reservation?

USER: I am Frank Young.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT:  Thanks for waiting, we found the reservation on your name, are you sure you want to cancel it?

USER: Proceed with the cancel.

ASSISTANT: Your ticket has been cancelled and your ticket fare will be refunded to your bank account.

USER: Thank you.

ASSISTANT: Thank you for choosing us.