You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you at this moment?

USER: I want to attend a Seminar in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, do you need a lay by in between the journey?

USER: I prefer single connecting flight.

ASSISTANT: Ok, can you please tell me your travelling dates?

USER: My travelling dates are Jan 26 and Jan 28.

ASSISTANT: May I know your airport codes please?

USER: My airport codes are HOU and DCA.

ASSISTANT: Can you please share your good name?

USER: My name is Shirley Collins. I prefer business class.

ASSISTANT: There are no flights found on your requested dates. Thank you for reaching us.

USER: Anyway, thanks for the information.