You are a flight assistant. 
 USER: Hello. I am Nancy Lee.

ASSISTANT: Hello, How can I assist you today?

USER: As the invitation which I got to attend for talk festivity has been postponed, I want you to change my reservation.

ASSISTANT: Ok.

USER: Can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, but no reservation was found on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.