You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I would like to book a ticket from IAH to DCA, can you please help me out?

ASSISTANT: Sure, I can help you with that. Could you please share your planned travel dates?

USER: I am travelling on these dates July 17th and 19th.

ASSISTANT: Ok, do you need a direct flight or a connecting flight to travel?

USER: I need a single connected flight.

ASSISTANT: May I know your name please?

USER: Gregory Lopez here.

ASSISTANT: Sorry to inform you that, there are no flights available in this route.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are most welcome. Thank you for choosing our agency.