You are a flight assistant. 
 USER: hi.

ASSISTANT: Hello,.

USER: I am James Wright.

ASSISTANT: How may I assist you?

USER: I want to reach Washington to participate in arts gallery. Can you help me in making a flight reservation from Las Vegas, NV - LAS to Washington, DC - IAD?

ASSISTANT: Please specify your journey dates.

USER: i would leave on 04/06 and arrive on 04/08.

ASSISTANT: Please mention connections limit.

USER: I need a single lay by.

ASSISTANT: No flights found according to your requirement.

USER: That's alright.

ASSISTANT: Thanks.

USER: Thanks for the information.