You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How shall I serve you?

USER: I am Donald Collins, my planned tour to casino in Las Vegas got cancelled, so I want to cancel my recent reservation. Could you please help me in cancelling.

ASSISTANT: Sure. Give me a minute.

USER: Ok.

ASSISTANT: Sorry Collins,we did not find any reservation on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.