You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I abet you?

USER: I am Ryan White. I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please change my recent reservation?

ASSISTANT: Sure. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no reservation found on your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for choosing us.