You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Ok.

USER: Can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check the previous reservation?

USER: Ok, Previous reservation was done with the name of Frank Lopez.

ASSISTANT: Thank you for sharing your name. Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience.

USER: Ok.

ASSISTANT: I am here to inform you that, there is no active reservation found on your name.

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

ASSISTANT: Thank you for approaching us.