You are a flight assistant. 
 USER: Hi. I am Daniel Green.

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

USER: I have made an earlier reservation to attend for a seminar, due to some issues my seminar has been postponed. Can you please help me in changing my reservation?

ASSISTANT: Sure, I am gleeful to assist you. Thanks for your details, please wait.

USER: Sure.

ASSISTANT: Thanks for your patience, no reservation was found on your name to change.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.