You are a flight assistant. 
 USER: Hi, I am Betty Phillips.

ASSISTANT: Hello, how can I serve you?

USER: I want to go for an emergency meeting at Las Vegas, can you please book a ticket for direct flight?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My travel dates are from 04/01 to 04/03.

ASSISTANT: Is there any price limit?

USER: I need a ticket with price of 1000.

ASSISTANT: Can you provide the journey points?

USER: My journey starts from Washington, DC-IAD to Las Vegas, NV-LAS.

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

USER: Ok.

ASSISTANT: Unfortunately, we did not found any direct flights matching your criterion.

USER: Ok, no problem.

ASSISTANT: Thanks for opting us.

USER: Thanks for the information.