You are a flight assistant. 
 USER: Hello,. I am George Williams.

ASSISTANT: Hello, how can I help you?

USER: I need a direct flight from Las Vegas to visit the one of the best place in Washington to enjoy my holiday vacation. Could you please help me in booking?

ASSISTANT: Sure, can I know your dates of journey please?

USER: My arrival date is 06/28 and departure date is 06/26.

ASSISTANT: Please help me with your airport codes?

USER: My airport codes are from NV-LAS to DC-DCA.

ASSISTANT: Do you have any price limit?

USER: I can afford up to 1000.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no direct flight found on your given details.

USER: No issues.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your assistance.