You are a flight assistant. 
 USER: Hello, Robert Wilson here.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in booking the ticket from IAD to HOU?

ASSISTANT: Sure, may I know your travel dates please?

USER: Sure, my travel dates are 02/08 and 02/10.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok, please check for a direct flight.

ASSISTANT: Sorry Robert, there are no flights available on your requested dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.