You are a flight assistant. 
 USER: Hello, Ronald Allen here.

ASSISTANT: Hello, how can I provide service to you?

USER: My seminar has been postponed so, I want to cancel my recent reservation. Can you help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Thanks for your service.