You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: Could you please book a flight ticket from HOU to IAD?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are Apr 08 and Apr 10.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight. And I want to return in the afternoon.

ASSISTANT: Please help me with your name for booking.

USER: I am Kimberly Nelson.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: No problem, thank you.

ASSISTANT: Most welcome.