You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I am John Williams. I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me with changing my reservation?

ASSISTANT: Sure, I will help you in changing.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation on your given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.