You are a flight assistant. 
 USER: Hello,. I am Stephen Roberts.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please cancel my reservation, due to cancel of my seminar?

ASSISTANT: Sure, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation with your name in our portal to cancel further.

USER: Ok, no issue. Thank you.

ASSISTANT: You are welcome, have a great day.