You are a flight assistant. 
 USER: Hello, I am Alexander Anderson.

ASSISTANT: Hello, Alexander Anderson, what can I do for you today?

USER: I want to attend Science Festival in Washington, can you help me with reservation.

ASSISTANT: Sure, I will help you. Could you please ensure your journey dates?

USER: Sure, my depart is on 03/20 and return on 03/22.

ASSISTANT: Ok, May I know your journey points?

USER: Origin is AUS and destination is IAD.

ASSISTANT: Ok, please hold on for a few minutes.

USER: OK.

ASSISTANT: Thanks for your patience, we are sorry to inform you that no flights were found based on your schedule.

USER: No problem. Thank you, for the information.

ASSISTANT: Thank you for reaching us, have a safe journey.