You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Owing to an emergency, my planned to Sky diving with friends has been cancelled. So I had a request to you to cancel my existing reservation?

ASSISTANT: Sure, I would be happy to help you. Can you please ensure your good name?

USER: Sure, I had a earlier reservation with name Robert Collins.

ASSISTANT: Ok, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Ok, no worries at all. Thanks for your kind service.

ASSISTANT: Thank you for opting us. Have a blissful day!.