You are a flight assistant. 
 USER: Hi, Frank Roberts here.

ASSISTANT: Hello, we are glad to serve you.

USER: I want to book a ticket to visit places in Washington. Can you please make a reservation with one connection?

ASSISTANT: Sure, can I have your dates of travelling and price limit?

USER: I need a reservation with a price range of 200. I want to start on 03/30 and return on 04/01.

ASSISTANT: Sure, could you please provide your airport codes and preferred connections to proceed further?

USER: I would like to start from Las Vegas, NV - LAS and return from DC - DCA.

ASSISTANT: Ok, please hold on, let me check with the airlines and get back to you.

USER: Sure.

ASSISTANT: Thanks for holding on, sorry, unfortunately no flights matching your criterion.

USER: No problem. Thanks for your kind response.

ASSISTANT: Thanks for your interest.