You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

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

USER: Sept, 8 and Sept, 10 are my planned travel dates.

ASSISTANT: May I know your connection limit?

USER: I need direct flight.

ASSISTANT: Your good name please.

USER: Catherine Green here.

ASSISTANT: We found a direct airline: Frontier, flight number: 1000 and price is 100.

USER: Please proceed for further.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.