You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: My name is Brenda Carter.

ASSISTANT: Brenda, how can I assist you for today?

USER: Actually, I wanted to travel to IAD for a interview, but due to some reason, my interview is postponed. Could you help me out?

ASSISTANT: Sure, please give me a minute so that I can check the details of your existing reservation.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight ticket booked previously with your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a great day.