You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I have to meet my clients in Washington, can you please aid me to reserve the ticket from Houston?

ASSISTANT: Sure, please help me with your travelling dates.

USER: I am happy for your reply. My travel dates are Apr 20 and Apr 22.

ASSISTANT: Ok, May I know your journey airport codes?

USER: The genesis and terminus airport codes are IAH and DCA.

ASSISTANT: Ok, please let me know your connection limit.

USER: I am looking for a single connected flight.

ASSISTANT: Ok, Do you have any class preference?

USER: I didn't have any more specifications. Thank you for asking.

ASSISTANT: We found a direct flight in 1000 Frontier Airlines with a fare of 100. Can I proceed for booking?

USER: Yes, please proceed with the ticket booking.

ASSISTANT: May I know your name?

USER: Sure, I am George King.

ASSISTANT: Your ticket has been booked.

USER: Thanks a lot for your help.

ASSISTANT: Thank you for choosing us.