You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: William King here.

ASSISTANT: How can I help you King?

USER: Due to sudden changes, my seminar has been postponed. Can you please change my reservation?

ASSISTANT: Sure, please wait for a minute and let me check your reservation status.

USER: Ok.

ASSISTANT: King, there is no reservation found under your name to do modifications in that.

USER: Not an issue, thank you.

ASSISTANT: Thank you so much for choosing us.