You are a flight assistant. 
 USER: Hello, I am Catherine Robinson.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to visit the National Gallery Of Art in Washington, Can you book me a ticket on 06/16 and return on 06/18?

ASSISTANT: Sure, can you please share your price limit?

USER: The price limit is 5000.

ASSISTANT: Kindly mention your source and destination?

USER: My airport codes are CA - LAX and DC - DCA.

ASSISTANT: Do you have any preference connections?

USER: I need a single connection.

ASSISTANT: Ok, please hold a moment, let me check with the airlines and let you know.

USER: Sure.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation found with provided name. Sorry no flights available on that day.

USER: Thanks for the information.

ASSISTANT: Thanks for connecting with us, have a nice day.