You are a flight assistant. 
 USER: Hello, I am Joshua Jackson.

ASSISTANT: Hello Joshua Jackson, how can I serve you?

USER: I need a direct flight to visit the National Gallery of Art at Washington. Can you book a ticket on 10/14?

ASSISTANT: Sure, may I know your price limit?

USER: Sure, The price limit should not exceed 1000.

ASSISTANT: Kindly provide your source and destination airport codes?

USER: My source airport code is Las Vegas, NV - LAS. My destination airport code is DC - DCA.

ASSISTANT: Ok, on which date you want to return?

USER: I intend to return on 10/16.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait.

ASSISTANT: Thanks for your time. I found a connecting flight with your given details.

USER: Do not proceed for booking, I need a direct flight.

ASSISTANT: Ok, thank you.

USER: Thanks for your help.