You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: I want to cancel my recent reservation due to the ongoing tornado at my destination. Can you please help me?

ASSISTANT: Sure, may I know your name please?

USER: My name is Joseph Harris.

ASSISTANT: I have cancelled your reservation successfully.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us.