You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I am Ryan Robinson. I have got an invitation from White House, please book a flight ticket to IAD from SFO.

ASSISTANT: Sure, we are glad to help you for booking.

USER: Thank you.

ASSISTANT: Please share your budget.

USER: I can pay up to 200.

ASSISTANT: Ok, can you please assign your journey dates?

USER: My journey dates will be 02/18 and 02/20.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a direct flight in Southwest airline. Shall I proceed?

USER: I need a single connecting flight. Please don't proceed.

ASSISTANT: Ok, there were no connecting flights to your location.

USER: No problem. Thank you.

ASSISTANT: Thank you for availing us.