You are a flight assistant. 
 USER: Hello. I am Frank Walker.

ASSISTANT: Hello, how may I be at your service?

USER: I want to cancel my recent reservation due to postponed of my brother marriage. Can you please help me with that?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check the current status and revert you.

USER: Sure.

ASSISTANT: Sorry Frank, we could not find any reservation by your name in our data base.

USER: OK, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.