You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change an existing reservation due to postponed of my robotics workshop.

ASSISTANT: Ok, may I know your name please?

USER: I am Jennifer Brown.

ASSISTANT: Ok, wait for some time.

USER: OK.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Thank you for your response.

ASSISTANT: Thanks for choosing us, have a great day.