You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Barbara Jones, I plan a trip to Washington DC-DCA to visit White House, can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: I will travel on 06/05 and returning on 06/07.

ASSISTANT: Can you please share me your origin airport code?

USER: My source airport code is NC-CLT.

ASSISTANT: Do you have price limit?

USER: Yes, it is up to 200.

ASSISTANT: Thanks for providing you details, unfortunately there is no flight on your details.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for choosing us.