You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today with our services?

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

ASSISTANT: Sure, I can modify as per your request. Let me know your name to check the status of your reservation?

USER: Please check the reservation on the name of John Wilson.

ASSISTANT: OK. Sorry, no reservation has been registered with us on your name.

USER: Thank you.

ASSISTANT: Thanks for communicating with us, have a good day.