You are a flight assistant. 
 USER: Hello, I am Ronald Williams.

ASSISTANT: Hello, how may I aid you today?

USER: I want to cancel my reservation due to sudden postpone of my exam.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for your time, no reservation found with your name.

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

ASSISTANT: Thank you for reaching us.