You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anthony White.

ASSISTANT: How may I serve you at this moment?

USER: Can you please find a flight from Las Vegas to Washington?

ASSISTANT: Sure, please share your travelling dates.

USER: Thank you. I am willing to travel on the dates of May 11 and May 13.

ASSISTANT: Ok, may I know your airport codes?

USER: The source and destination airport codes are LAS and DCA.

ASSISTANT: Do you need any halt in between the journey?

USER: I need a direct flight for my journey.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok, take your time.

ASSISTANT: There are no flights found on your requested dates. Thank you for reaching us.

USER: You are welcome. Thank you for checking the flight availability.