You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Actually my exam is postponed so that I want to cancel my recent reservation, can you help me?

ASSISTANT: Can I know your name please?

USER: Sure, I am Kimberly Green.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: Oh! that's fine. Thank you for your information.

ASSISTANT: Thank you for contacting us.