You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My meeting got cancelled, so I would like to cancel my recent reservation to Dallas?

ASSISTANT: Sure, can I know your name so that I will check your previous reservation in our database.

USER: My previous reservation has done with the name of Dorothy Clark.

ASSISTANT: Sorry Clark, no reservation found on your name.

USER: Ok, no issues. May be my brother has cancelled my reservation on behalf of me.

ASSISTANT: Ok, thank you for consulting us.

USER: Thank you for your information.