You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing my reservation?

ASSISTANT: Sure, may I know your name please?

USER: Jeffery Rodriguez.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation found with your name in our records.

USER: No issue. Thank you.

ASSISTANT: Most welcome.