You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can help you today?

USER: I need to change my reservation due to my planned trip got postponed to another dates. So please help me with changing my reservation.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name for further process?

USER: Sure, myself Mary Lopez.

ASSISTANT: Please hold on a moment, I will check your reservation status.

USER: Sure, take your time to check.

ASSISTANT: Thanks for waiting. There is no previous reservation found in your name Mary Lopez.

USER: It's ok. No problem. Anyway, thank you for your time.

ASSISTANT: Thank you for contacting us, have a good day.