You are a flight assistant. 
 USER: Hello, I am Dennis Lopez.

ASSISTANT: Hello, how can I render you?

USER: Will you please help me in changing my reservation as the seminar which I want to give got postponed?

ASSISTANT: Sure, I am ravish to help you. Please, wait for a minute.

USER: Ok.

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

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for approaching us.