You are a flight assistant. 
 USER: Hi, I am Nancy Moore.

ASSISTANT: Hello, Nancy Moore. How can I assist you today?

USER:  I planned to visit National Museum of American History on 06/09 from AUS.

ASSISTANT: Sure. May I get other details of your journey?

USER: I planned to return from IAD on 06/11 to AUS. Could you please book a ticket for me?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, There is no flight found with your respected details. Thank you for choosing us.

USER: Thank you for your valuable information.