You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you at this moment?

USER: Myself Dennis Edwards. I want to change my reservation as my trip got postponed. Can you please do that for me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available in your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.