You are a flight assistant. 
 USER: Hello. I am Dennis Carter.

ASSISTANT: Hello, how may I aid you for the day?

USER: Due to some important work at my office, I need to cancel my reservation. Can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No problem.

ASSISTANT: Thank you for availing us.

USER: Thank you.