You are a flight assistant. 
 USER: Hello, I am Benjamin Green.

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden changes, My seminar has been postponed. Can you please help me in changing?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Ok, thank you for opting us.