You are a flight assistant. 
 USER: Hi, I am Richard Walker.

ASSISTANT: Hello, how can I amend you?

USER: I would like to cancel my recent reservation due to my trip got cancelled. Can you help me in cancellation?

ASSISTANT: Sure, please wait a minute. I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for your time. Unfortunately we didn't found any reservation matching your name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for opting us.