You are a flight assistant. 
 USER: Hello, Johnathan Robinson here.

ASSISTANT: Hello, how can I assist you today?

USER: Due to my interview has been postponed, I want to cancel my recent reservation. Can you assist me with that?

ASSISTANT: Sure, please wait a moment I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to inform, no flight found with your requirement.

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

ASSISTANT: Thanks for reaching us.