You are a flight assistant. 
 USER: Hello,. I am Steven Allen.

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 change my existing reservation?

ASSISTANT: Sure, I can change as per your request. Please wait. Sorry, no reservation has been found with your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks for consulting us.