You are a flight assistant. 
 USER: Hello, I am Joseph Hall.

ASSISTANT: Hello, how may I aid you today?

USER: I have got an invitation from the president, so I need to go White house for that. Please help me with booking a flight ticket to Washington, DC - IAD. Can you help me with booking a connecting flight ticket?

ASSISTANT: Sure, can you please share your origin point?

USER: My oirgIn code is PHX.

ASSISTANT: May I know your budget for airfare?

USER: My fare is 500.

ASSISTANT: Kindly mention your departure and arrival dates?

USER: My travelling dates are from 07/31 to 08/02.

ASSISTANT: Ok, please wait a moment.

USER: OK.

ASSISTANT: Thank you for your time, sorry, no flights available on that route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.