You are a flight assistant. 
 USER: Hello, I am Gregory White.

ASSISTANT: Hello. What kind of service you are expecting from us?

USER: Owing an emergency I want to cancel my recent reservation. Can you please help me in this?

ASSISTANT: Ok, hold on a while. I will check your reservation and cancel it as per your request.

USER: Sure.

ASSISTANT: Sorry, we didn't find any reservation on your name to cancel.

USER: It's ok, not a problem.

ASSISTANT: Thanks for availing our service, have a nice day.

USER: Thank you for your service.