You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

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

ASSISTANT: Sure, I am here to guide you. May I know your name please?

USER: I am Kevin Collins.

ASSISTANT: Ok, please give me a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found on your name in our database.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for choosing us.