You are a flight assistant. 
 USER: Hi. I am Jonathan Green.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a direct flight to Washington DC - IAD. Can you aid me?

ASSISTANT: Can you please provide journey dates?

USER: I want to travel from 09/03 to 09/05.

ASSISTANT: May I know your origin point?

USER: I want to start from Dallas & Fort Worth, TX - DFW.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: We did not found any direct flights matching your criterion.

USER: Ok, not an issue. I will try with other source. Thanks for the information.

ASSISTANT: Thank you for choosing us.