You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Please help me to book a flight ticket from IAD to HOU.

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are from Nov, 30 to Dec, 02.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight to fly.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I prefer to depart in the morning.

ASSISTANT: May I know your name to proceed further?

USER: Kevin White.

ASSISTANT: I am sorry to inform you that there is no flight available at your request.

USER: Thank you for your information.

ASSISTANT: Thank you for contacting us.