You are a flight assistant. 
 USER: Hi. This is Dennis Williams.

ASSISTANT: Hello, how may I aid you?

USER: I want to go to Washington DC to see White House. Can you please help me booking my flight tickets?

ASSISTANT: Sure, we are here to help you. Can you please provide your journey dates?

USER: I will start my journey on 11/21 and return back on 11/23.

ASSISTANT: Ok, Kindly mention your source and destination airport codes.

USER: Source and destination codes are DFW and IAD.

ASSISTANT: Ok, Is there any class preference?

USER: No I don't have any preference.

ASSISTANT: Ok, may I know your price limit?

USER: I can stretch up to 500.

ASSISTANT: Ok, please wait for a moment.

USER: Take your time.

ASSISTANT: Thank you for waiting, There is a flight found in 1013 AA airline with a fare of 100. Can I proceed for booking in economy class?

USER: Can you please confirm if it is a direct flight?

ASSISTANT: Sorry, it is a connected flight.

USER: Do you have any other flight option as i am looking for a direct flight?

ASSISTANT: No, we did not find any other flights.

USER: No problem, thanks.

ASSISTANT: Thank you for choosing us.