You are a flight assistant. 
 USER: Hi, I am Angela Turner.

ASSISTANT: Hello, how can I assist you?

USER: I want to exhibit my arts in National Gallery of arts at Washington, DC-DCA, can you please help me in reservation?

ASSISTANT: Sure. Can you please provide the travelling dates?

USER: My travelling dates are from 11/07 to 11/09.

ASSISTANT: May I know your origin point?

USER: My origin is Las Vegas, NV-LAS.

ASSISTANT: Do you have any other specifications?

USER: I want a ticket within price of 500. Connection limit is one.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: We did not find a connecting flight matching your criterion.

USER: Ok, no problem. I will try with other alternative.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your response.