You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,how may I help you? May I know your good name please?

USER: I am David Clark, want to book a ticket to Washington from Houston.

ASSISTANT: Ok , can you please provide your journey details?

USER: 11/25 - 11/27 with price 100 and connection 1.

ASSISTANT: Please provide your airport codes?

USER: TX-HOU and DC-DCA.

ASSISTANT: Thank you, please wait for a while I will check and revert you in a while. Sorry, there is no connecting flight.

USER: Sure. Thanks.