You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit National Gallery of Art. Can you do the reservation for me?

ASSISTANT: Please provide your travelling dates.

USER: 04/17 and 04/19.

ASSISTANT: Can you please provide your airport codes?

USER: Airport codes are LAX-DCA.

ASSISTANT: Do have any other requirements?

USER: I need a flight with one connection, Price should be equal or less than 200.

ASSISTANT: To proceed further can I know your name please?

USER: Eric Young.

ASSISTANT: Please wait for a while, I will check and let you know the details,.

USER: Sure.

ASSISTANT: Unfortunately there is no flight your matching requirements. Thank you for reaching us.

USER: No problem. Thank you for your response.

ASSISTANT: Have a nice day.