You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: How can I assist you today?

USER: I am Anthony Edwards. I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please change an existing reservation?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Ok, Thank you for your positive response. I will wait.

ASSISTANT: Sorry Edwards, no reservation found by your name in our database.

USER: No more issues. Thank you for your information.

ASSISTANT: It's my pleasure.