You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you now?

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, I will help you in changing.

USER: Thank you.

ASSISTANT: Please, share me your good name to check your reservation status.

USER: David Martinez.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, we have not found any active reservation on your name in our records.

USER: No issue, Thank you for the information.

ASSISTANT: Thank you for choosing us.