You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Robert Williams.

ASSISTANT: Ok.

USER: I want to cancel my recent reservation due to an emergency work, can you help me in cancel reservation?

ASSISTANT: Sure, I am pleased to help you. Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your time, sorry to inform we didn't find any reservation on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us, have a nice day.

USER: Thank you.