You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Edwards.

ASSISTANT: How can I help you at this moment?

USER: As my meeting got postponed at Dallas, can you please help me in changing my existing reservation to Dallas?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

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

USER: Sure, I will wait for your response.

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

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.