You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Actually my sister's engagement got postponed, so that I want to cancel my recent reservation, can you help me?

ASSISTANT: May I know your name please?

USER: Yes, my name is Kevin Taylor.

ASSISTANT: Please wait for a moment, let me check your details.

USER: Ok, sure.

ASSISTANT: Sorry, we did not find any reservation basis on your details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Anyway's thank you for your information.