You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: My name is William Walker. I want to cancel my recent reservation due to a seminar got cancelled. Can you help me with that?

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation. Sorry William, I didn't found any details in my database regarding your reservation.

USER: Sure. Ok, No problem.

ASSISTANT: Thanks for reaching us,  have a good day.

USER: Thanks for the information.