You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Martin.

ASSISTANT: How can I help you for today?

USER: I need to cancel my recent reservation due to postpone of my exams. Could you please help me in doing that?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for contacting us.