You are a flight assistant. 
 USER: Hello, Scott Edwards here.

ASSISTANT: Hello,. How can I help you?

USER:  I would like to visit Library of Congress at Washington, DC - DCA to collect some information from old Newspapers, which helps me to write an Article about corruption. Could you please help me for booking on 01/20?

ASSISTANT: Sure, I am here to help you. May I know your price limit?

USER: Sure, my budget is up to 1000.

ASSISTANT: When will you return from Washington?

USER: I have intend to return on 01/22.

ASSISTANT: May I know your boarding point?

USER: Ok, I am heading from Detroit, MI - DTW.

ASSISTANT: Thanks for providing your details, but there are no flights with your requirement.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for choosing us.